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<a href="options_8hpp.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* Flow</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> * Copyright 2023 Akamai Technologies, Inc.</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> *</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> * Licensed under the Apache License, Version 2.0 (the</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * &quot;License&quot;); you may not use this file except in</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * compliance with the License.  You may obtain a copy</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> * of the License at</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="comment"> *</span></div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="comment"> *   https://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="comment"> *</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="comment"> * Unless required by applicable law or agreed to in</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span><span class="comment"> * writing, software distributed under the License is</span></div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="comment"> * distributed on an &quot;AS IS&quot; BASIS, WITHOUT WARRANTIES OR</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="comment"> * CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="comment"> * See the License for the specific language governing</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="comment"> * permissions and limitations under the License. */</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span><span class="comment"></span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/// @file</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="comment"></span><span class="preprocessor">#pragma once</span></div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span> </div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span><span class="preprocessor">#include &quot;<a class="code" href="net__flow__fwd_8hpp.html">flow/net_flow/net_flow_fwd.hpp</a>&quot;</span></div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span><span class="preprocessor">#include &lt;boost/program_options.hpp&gt;</span></div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span> </div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>{</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span><span class="comment">// Types.</span></div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span><span class="comment"></span> </div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span><span class="comment">/**</span></div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span><span class="comment"> * A set of low-level options affecting a single Peer_socket.  All comments for `struct`</span></div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span><span class="comment"> * Node_options apply equally to Peer_socket_options (except, of course, those pertaining to the</span></div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span><span class="comment"> * nested Peer_socket_options instance).</span></div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span><span class="comment"> *</span></div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="comment"> * @see `struct` Node_options.</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span><span class="comment"> */</span></div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html">   35</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a></div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>{</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span><span class="comment"></span> </div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span><span class="comment">  /// Short-hand for boost.program_options config options description.  See setup_config_parsing().</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">   40</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">Options_description</a> = boost::program_options::options_description;</div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span><span class="comment"></span> </div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span><span class="comment">   * A time duration, with fine precision, that can be positive, zero, or negative (unless a specific option</span></div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="comment">   * specifies an additional constraint to that effect).  This is used for most (all?) time-based options in</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span><span class="comment">   * Node_options and Peer_socket_options.</span></div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span><span class="comment">   *</span></div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span><span class="comment">   * @internal</span></div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span><span class="comment">   *</span></div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span><span class="comment">   * This used to be an alias from `duration&lt;uint16_t, Fine_duration::period&gt;` to `Fine_duration_non_neg`,</span></div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span><span class="comment">   * meaning it was specifcally intended to be non-negative.  That constraint made sense for all time-based</span></div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span><span class="comment">   * options at the time and probably still does... but there was a problem: In Boost 1.50, the non-negative</span></div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span><span class="comment">   * implementation integer type caused a comparison to -1 somewhere inside their headers, which triggered a</span></div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span><span class="comment">   * (reasonable) gcc-4.2 warning.  Ironically, in Boost 1.48, using a negative-allowing type caused some</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span><span class="comment">   * other comparison triggering a similar warning.  Anyway, as of Boost 1.50, I&#39;ve decided to bite the bullet</span></div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span><span class="comment">   * and use a negative-allowing type after all (which causes no warning in that version) and enforce any</span></div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span><span class="comment">   * required non-negativeness (or even positiveness, where applicable) explicitly when calling</span></div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span><span class="comment">   * `VALIDATE_CHECK()` at option parse time.  (That was way longer an explanation than this deserved.)</span></div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span><span class="comment">   */</span></div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">   59</a></span>  <span class="keyword">using </span><a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> = <a class="code hl_typedef" href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">flow::Fine_duration</a>;</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span><span class="comment"></span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span><span class="comment">  /// The possible choices for congestion control strategy for the socket.</span></div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">   62</a></span><span class="comment"></span>  <span class="keyword">enum class</span> <a class="code hl_enumeration" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">Congestion_control_strategy_choice</a></div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>  {<span class="comment"></span></div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span><span class="comment">    /// Classic (Reno-style) AIMD congestion control.</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span><span class="comment"></span>    S_CLASSIC = 0,<span class="comment"></span></div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span><span class="comment">    /// Classic congestion control but with loss resulting in a window chosen from an outgoing bandwidth estimate.</span></div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span><span class="comment"></span>    S_CLASSIC_BANDWIDTH_ESTIMATED</div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>  };</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span> </div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span><span class="comment"></span> </div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span><span class="comment">   * Constructs a Peer_socket_options with values equal to those used by Node when the Node</span></div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span><span class="comment">   * creator chooses not to supply custom options.</span></div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span><span class="comment">   */</span></div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac31b91c6f8c7b0d7a4e29fd218e5f9dc">Peer_socket_options</a>();</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span> </div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span><span class="comment"></span> </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span><span class="comment">   * Analogous to Node_options::setup_config_parsing().  See that method.</span></div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span><span class="comment">   *</span></div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span><span class="comment">   * @param opts_desc</span></div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span><span class="comment">   *        The #Options_description object into which to load the help information, defaults, and</span></div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="comment">   *        mapping to members of `*this`.</span></div>
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno">   86</span><span class="comment">   */</span></div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aa6d94acf3c746c8f59c91ffa824ef8bd">setup_config_parsing</a>(<a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">Options_description</a>* opts_desc);</div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span> </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span><span class="comment"></span> </div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span><span class="comment">   * The size of block that we will strive to (and will, assuming at least that many bytes are</span></div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span><span class="comment">   * available in Send buffer) pack into each outgoing DATA packet.  It is assumed the other side is</span></div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span><span class="comment">   * following the same policiy (any packets that do not -- i.e., exceed this size -- are dropped).</span></div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span><span class="comment">   * This is an important control; the higher it is the better for performance AS LONG AS it&#39;s not so</span></div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span><span class="comment">   * high it undergoes IP fragmentation (or does that even happen in UDP? if not, even worse --</span></div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span><span class="comment">   * it&#39;ll just be dropped and not sent!).  The performance impact is major; e.g., assuming no</span></div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span><span class="comment">   * fragmentation/dropping, we&#39;ve seen a ~1500 byte MBS result in 20-30% higher throughput than</span></div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span><span class="comment">   * 1024 byte MBS.</span></div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span><span class="comment">   *</span></div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span><span class="comment">   * Additionally, if using `net_flow` module with no reliability feature -- i.e., if you want to perform FEC</span></div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span><span class="comment">   * or something else outside the Flow protocol -- then it is absolutely essential that EVERY `send*()` call</span></div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span><span class="comment">   * provides a buffer whose size is a multiple of max-block-size.  Otherwise packet boundaries</span></div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span><span class="comment">   * will not be what you expect, and you will get what seems to be corrupted data at the</span></div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span><span class="comment">   * application layer (since our stream-based API has no way of knowing where your message begins</span></div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span><span class="comment">   * or ends).  Alternatively you can encode message terminators or packet sizes, but since in</span></div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span><span class="comment">   * unreliable mode integrity of a given block is guaranteed only if all blocks align with</span></div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span><span class="comment">   * max-block-size boundaries, you&#39;ll still probably be screwed.</span></div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span><span class="comment">   *</span></div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span><span class="comment">   * @todo max-block-size should be dynamically determined (but overridable by this option).  That</span></div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span><span class="comment">   * is a complex topic, however, with considerations such as MTU discovery, ICMP errors, and who knows</span></div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span><span class="comment">   * what else.</span></div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span><span class="comment">   */</span></div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeaaf832a38a5e334789e81e214686ea7">  114</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeaaf832a38a5e334789e81e214686ea7">m_st_max_block_size</a>;</div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span><span class="comment"></span> </div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span><span class="comment">   * How often to resend SYN or SYN_ACK while SYN_ACK or SYN_ACK_ACK, respectively, has not been received.</span></div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span><span class="comment">   * In other words, this controls the pause between retries during the connection opening phase, by either side,</span></div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span><span class="comment">   * if the other side is not responding with the appropriate response.</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span><span class="comment">   */</span></div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8f18c8222ade5f99b83a85e0203ff130">  121</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8f18c8222ade5f99b83a85e0203ff130">m_st_connect_retransmit_period</a>;</div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span><span class="comment"></span> </div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span><span class="comment">  /// How long from the first SYN or SYN_ACK to allow for connection handshake before aborting connection.</span></div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac75171c4f1086d0aa38248ae5ffba884">  124</a></span><span class="comment"></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac75171c4f1086d0aa38248ae5ffba884">m_st_connect_retransmit_timeout</a>;</div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span><span class="comment"></span> </div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span><span class="comment">   * Maximum number of bytes that the Send buffer can hold.  This determines how many bytes user can</span></div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span><span class="comment">   * `send()` while peer cannot send over network until send() refuses to take any more bytes.  Notew</span></div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span><span class="comment">   * that any value given will be increased, if necessary, to the nearest multiple of</span></div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span><span class="comment">   * max-block-size.  This is important to preserve message boundaries when operating in</span></div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span><span class="comment">   * unreliable mode (guaranteed max-block-size-sized chunks of data will be sent out in their</span></div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span><span class="comment">   * entirety instead of being fragmented).</span></div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span><span class="comment">   */</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8ca6086022691700f5e5d2dc87ca92fd">  134</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8ca6086022691700f5e5d2dc87ca92fd">m_st_snd_buf_max_size</a>;</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span><span class="comment"></span> </div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span><span class="comment">   * Maximum number of bytes that the Receive buffer can hold.  This determines how many bytes</span></div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span><span class="comment">   * can be received in the background by the Node without user doing any receive()s.  It is also</span></div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span><span class="comment">   * rounded up to to the nearest multiple of max-block-size.</span></div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span><span class="comment">   */</span></div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a171480324f26432928738532cb3c8556">  141</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a171480324f26432928738532cb3c8556">m_st_rcv_buf_max_size</a>;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span><span class="comment"></span> </div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span><span class="comment">   * Whether flow control (a/k/a receive window a/k/a rcv_wnd management) is enabled.  If this is</span></div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span><span class="comment">   * disabled, an infinite rcv_wnd will always be advertised to the sender; so if the Receive buffer</span></div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span><span class="comment">   * is exceeded packets are dropped as normal, but the sender will not know it should stop sending</span></div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span><span class="comment">   * until Receive buffer space is freed.  If this is enabled, we keep the sender informed of how</span></div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span><span class="comment">   * much Receive buffer space is available, so it can suspend the flow as necessary.</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span><span class="comment">   */</span></div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad9a31f63eea6f89952a89ea0385d9a2e">  150</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad9a31f63eea6f89952a89ea0385d9a2e">m_st_rcv_flow_control_on</a>;</div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span><span class="comment"></span> </div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span><span class="comment">   * % of rcv-buf-max-size such that if Receive buffer stores up to (100 + this many) % of</span></div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span><span class="comment">   * rcv-buf-max-size bytes, the bytes will still be accepted.  In other words, this allows the max</span></div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span><span class="comment">   * Receive buffer to hold slightly more than rcv-buf-max-size bytes.  However, the current Receive</span></div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span><span class="comment">   * buffer capacity advertised to the other side of the connection will be based on the</span></div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span><span class="comment">   * non-inflated rcv-buf-max-size.  This option provides some protection against the fact that the</span></div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span><span class="comment">   * receive window value sent to the other side will lag behind reality somewhat.</span></div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span><span class="comment">   */</span></div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aa6d16c98186187fdffadcfb853d58410">  160</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aa6d16c98186187fdffadcfb853d58410">m_st_rcv_buf_max_size_slack_percent</a>;</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span><span class="comment"></span> </div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span><span class="comment">   * % of rcv-buf-max-size that has to be freed, since the last receive window advertisement, via</span></div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span><span class="comment">   * user popping data from Receive buffer, before we must send a receive window advertisement.</span></div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span><span class="comment">   * Normally we send rcv_wnd to the other side opportunistically in every ACK; but there can be</span></div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span><span class="comment">   * situations when there is no packet to acknowledge, and hence we must specifically make a</span></div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span><span class="comment">   * packet just to send over rcv_wnd.  Typically we should only need to do this if the buffer was</span></div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span><span class="comment">   * exceeded and is now significantly freed.  This value must be in [1, 100], but anything over 50</span></div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span><span class="comment">   * is probably pushing it.</span></div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span><span class="comment">   */</span></div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#af483d0292f363e7dbf14dc7a2dd49f3f">  171</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#af483d0292f363e7dbf14dc7a2dd49f3f">m_st_rcv_buf_max_size_to_advertise_percent</a>;</div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="comment"></span> </div>
<div class="line"><a id="l00173" name="l00173"></a><span class="lineno">  173</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00174" name="l00174"></a><span class="lineno">  174</span><span class="comment">   * The limit on the size of Peer_socket::m_rcv_packets_with_gaps, expressed as what percentage the</span></div>
<div class="line"><a id="l00175" name="l00175"></a><span class="lineno">  175</span><span class="comment">   * maximal size of that structure times max-block-size is of the maximal receive buffer size.  For</span></div>
<div class="line"><a id="l00176" name="l00176"></a><span class="lineno">  176</span><span class="comment">   * example, if this is 200, then Peer_socket::m_rcv_packets_with_gaps can represent up to roughly</span></div>
<div class="line"><a id="l00177" name="l00177"></a><span class="lineno">  177</span><span class="comment">   * 2x as many full-sized blocks as the Receive buffer can.  This should also by far exceed any</span></div>
<div class="line"><a id="l00178" name="l00178"></a><span class="lineno">  178</span><span class="comment">   * sender congestion window max size to avoid packet loss.</span></div>
<div class="line"><a id="l00179" name="l00179"></a><span class="lineno">  179</span><span class="comment">   *</span></div>
<div class="line"><a id="l00180" name="l00180"></a><span class="lineno">  180</span><span class="comment">   * @see Peer_socket::m_rcv_packets_with_gaps for details.</span></div>
<div class="line"><a id="l00181" name="l00181"></a><span class="lineno">  181</span><span class="comment">   * @see Peer_socket::m_rcv_syn_rcvd_data_q.</span></div>
<div class="line"><a id="l00182" name="l00182"></a><span class="lineno">  182</span><span class="comment">   */</span></div>
<div class="line"><a id="l00183" name="l00183"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#af78ca6cf3c6da3bc24cea40d522f0bdb">  183</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#af78ca6cf3c6da3bc24cea40d522f0bdb">m_st_rcv_max_packets_after_unrecvd_packet_ratio_percent</a>;</div>
<div class="line"><a id="l00184" name="l00184"></a><span class="lineno">  184</span><span class="comment"></span> </div>
<div class="line"><a id="l00185" name="l00185"></a><span class="lineno">  185</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00186" name="l00186"></a><span class="lineno">  186</span><span class="comment">   * The maximum amount of time to delay sending ACK with individual packet&#39;s acknowledgment since</span></div>
<div class="line"><a id="l00187" name="l00187"></a><span class="lineno">  187</span><span class="comment">   * receiving that individual packet.  If set to zero duration, any given individual acknowledgment</span></div>
<div class="line"><a id="l00188" name="l00188"></a><span class="lineno">  188</span><span class="comment">   * is sent within a non-blocking amount of time of its DATA packet being read.  Inspired by RFC</span></div>
<div class="line"><a id="l00189" name="l00189"></a><span class="lineno">  189</span><span class="comment">   * 1122-4.2.3.2.</span></div>
<div class="line"><a id="l00190" name="l00190"></a><span class="lineno">  190</span><span class="comment">   */</span></div>
<div class="line"><a id="l00191" name="l00191"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#add7ccb9e8cd0715ca78e0710d2a6db06">  191</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#add7ccb9e8cd0715ca78e0710d2a6db06">m_st_delayed_ack_timer_period</a>;</div>
<div class="line"><a id="l00192" name="l00192"></a><span class="lineno">  192</span><span class="comment"></span> </div>
<div class="line"><a id="l00193" name="l00193"></a><span class="lineno">  193</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00194" name="l00194"></a><span class="lineno">  194</span><span class="comment">   * If there are at least this many TIMES max-block-size bytes&#39; worth of individual acknowledgments</span></div>
<div class="line"><a id="l00195" name="l00195"></a><span class="lineno">  195</span><span class="comment">   * to be sent, then the delayed ACK timer is to be short-circuited, and the accumulated</span></div>
<div class="line"><a id="l00196" name="l00196"></a><span class="lineno">  196</span><span class="comment">   * acknowledgments are to be sent as soon as possible.  Inspired by RFC 5681.</span></div>
<div class="line"><a id="l00197" name="l00197"></a><span class="lineno">  197</span><span class="comment">   */</span></div>
<div class="line"><a id="l00198" name="l00198"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7a76f7ae03e258b30b04c7350481de6">  198</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7a76f7ae03e258b30b04c7350481de6">m_st_max_full_blocks_before_ack_send</a>;</div>
<div class="line"><a id="l00199" name="l00199"></a><span class="lineno">  199</span><span class="comment"></span> </div>
<div class="line"><a id="l00200" name="l00200"></a><span class="lineno">  200</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00201" name="l00201"></a><span class="lineno">  201</span><span class="comment">   * Whether to enable reliability via retransmission.  If `false`, a detected lost packet may have</span></div>
<div class="line"><a id="l00202" name="l00202"></a><span class="lineno">  202</span><span class="comment">   * implications on congestion control (speed at which further data are sent) but will not cause</span></div>
<div class="line"><a id="l00203" name="l00203"></a><span class="lineno">  203</span><span class="comment">   * that packet to be resent; receiver application code either has to be OK with missing packets or</span></div>
<div class="line"><a id="l00204" name="l00204"></a><span class="lineno">  204</span><span class="comment">   * must implement its own reliability (e.g., FEC).  Packets may also be delivered in an order</span></div>
<div class="line"><a id="l00205" name="l00205"></a><span class="lineno">  205</span><span class="comment">   * different from the way they were sent.  If `true`, the receiver need not worry about it, as any</span></div>
<div class="line"><a id="l00206" name="l00206"></a><span class="lineno">  206</span><span class="comment">   * lost packets will be retransmitted with no participation from the application code on either</span></div>
<div class="line"><a id="l00207" name="l00207"></a><span class="lineno">  207</span><span class="comment">   * side, as in TCP.  Also as in TCP, this adds order preservation, so that the stream of bytes sent</span></div>
<div class="line"><a id="l00208" name="l00208"></a><span class="lineno">  208</span><span class="comment">   * will be exactly equal to the stream of bytes received.  Retransmission removes the requirement</span></div>
<div class="line"><a id="l00209" name="l00209"></a><span class="lineno">  209</span><span class="comment">   * for the very exacting block-based way in which `send()` and friends must be called.</span></div>
<div class="line"><a id="l00210" name="l00210"></a><span class="lineno">  210</span><span class="comment">   *</span></div>
<div class="line"><a id="l00211" name="l00211"></a><span class="lineno">  211</span><span class="comment">   * This option must have the same value on both sides of the connection, or the server will refuse</span></div>
<div class="line"><a id="l00212" name="l00212"></a><span class="lineno">  212</span><span class="comment">   * the connection.</span></div>
<div class="line"><a id="l00213" name="l00213"></a><span class="lineno">  213</span><span class="comment">   */</span></div>
<div class="line"><a id="l00214" name="l00214"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a6c35e6014182ccfcbee6bed4571a8360">  214</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a6c35e6014182ccfcbee6bed4571a8360">m_st_rexmit_on</a>;</div>
<div class="line"><a id="l00215" name="l00215"></a><span class="lineno">  215</span><span class="comment"></span> </div>
<div class="line"><a id="l00216" name="l00216"></a><span class="lineno">  216</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00217" name="l00217"></a><span class="lineno">  217</span><span class="comment">   * If retransmission is enabled and a given packet is retransmitted this many times and has to be</span></div>
<div class="line"><a id="l00218" name="l00218"></a><span class="lineno">  218</span><span class="comment">   * retransmitted yet again, the connection is reset.  Should be positive.</span></div>
<div class="line"><a id="l00219" name="l00219"></a><span class="lineno">  219</span><span class="comment">   */</span></div>
<div class="line"><a id="l00220" name="l00220"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a0b37da87848d01220c7e58f90e6764ba">  220</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a0b37da87848d01220c7e58f90e6764ba">m_st_max_rexmissions_per_packet</a>;</div>
<div class="line"><a id="l00221" name="l00221"></a><span class="lineno">  221</span><span class="comment"></span> </div>
<div class="line"><a id="l00222" name="l00222"></a><span class="lineno">  222</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00223" name="l00223"></a><span class="lineno">  223</span><span class="comment">   * Once socket enters ESTABLISHED state, this is the value for Peer_socket::m_snd_drop_timeout until the first RTT</span></div>
<div class="line"><a id="l00224" name="l00224"></a><span class="lineno">  224</span><span class="comment">   * measurement is made (the first valid acknowledgment arrives).</span></div>
<div class="line"><a id="l00225" name="l00225"></a><span class="lineno">  225</span><span class="comment">   */</span></div>
<div class="line"><a id="l00226" name="l00226"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a02afb5ed4201d83c87a3a30fcbdda489">  226</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a02afb5ed4201d83c87a3a30fcbdda489">m_st_init_drop_timeout</a>;</div>
<div class="line"><a id="l00227" name="l00227"></a><span class="lineno">  227</span><span class="comment"></span> </div>
<div class="line"><a id="l00228" name="l00228"></a><span class="lineno">  228</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00229" name="l00229"></a><span class="lineno">  229</span><span class="comment">   * If `true`, when scheduling Drop Timer, schedule it for Drop Timeout relative to the send time of</span></div>
<div class="line"><a id="l00230" name="l00230"></a><span class="lineno">  230</span><span class="comment">   * the earliest In-flight packet at the time.  If `false`, also schedule DTO relative to the time of</span></div>
<div class="line"><a id="l00231" name="l00231"></a><span class="lineno">  231</span><span class="comment">   * scheduling.  The latter is less aggressive and is recommended by RFC 6298.</span></div>
<div class="line"><a id="l00232" name="l00232"></a><span class="lineno">  232</span><span class="comment">   */</span></div>
<div class="line"><a id="l00233" name="l00233"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a638ca4ecd9d8bfc8710bda71687c4ea3">  233</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a638ca4ecd9d8bfc8710bda71687c4ea3">m_st_drop_packet_exactly_after_drop_timeout</a>;</div>
<div class="line"><a id="l00234" name="l00234"></a><span class="lineno">  234</span><span class="comment"></span> </div>
<div class="line"><a id="l00235" name="l00235"></a><span class="lineno">  235</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00236" name="l00236"></a><span class="lineno">  236</span><span class="comment">   * If `true`, when the Drop Timer fires, all In-flight packets are to be considered Dropped (and thus the</span></div>
<div class="line"><a id="l00237" name="l00237"></a><span class="lineno">  237</span><span class="comment">   * timer is to be disabled).  If `false`, only the earliest In-flight packet is to be considered Dropped (and</span></div>
<div class="line"><a id="l00238" name="l00238"></a><span class="lineno">  238</span><span class="comment">   * thus the timer is to restart).  RFC 6298 recommends `false`.  `true` is more aggressive.</span></div>
<div class="line"><a id="l00239" name="l00239"></a><span class="lineno">  239</span><span class="comment">   */</span></div>
<div class="line"><a id="l00240" name="l00240"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac6f4da1892e2157e60772ed74298b2b2">  240</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac6f4da1892e2157e60772ed74298b2b2">m_st_drop_all_on_drop_timeout</a>;</div>
<div class="line"><a id="l00241" name="l00241"></a><span class="lineno">  241</span><span class="comment"></span> </div>
<div class="line"><a id="l00242" name="l00242"></a><span class="lineno">  242</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00243" name="l00243"></a><span class="lineno">  243</span><span class="comment">   * If an In-flight packet is acknowledged, but it is not the earliest In-flight packet (i.e., it&#39;s</span></div>
<div class="line"><a id="l00244" name="l00244"></a><span class="lineno">  244</span><span class="comment">   * an out-of-order acknowledgment), and this is `true`, the timer is restarted.  Otherwise the timer</span></div>
<div class="line"><a id="l00245" name="l00245"></a><span class="lineno">  245</span><span class="comment">   * continues to run.  The former is less aggressive.  RFC 6298 wording is ambiguous on what it</span></div>
<div class="line"><a id="l00246" name="l00246"></a><span class="lineno">  246</span><span class="comment">   * recommends (not clear if cumulative ACK only, or if SACK also qualifies).</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   */</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae7d5eb1b4e37317478c3b25bc3c8c245">  248</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae7d5eb1b4e37317478c3b25bc3c8c245">m_st_out_of_order_ack_restarts_drop_timer</a>;</div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class="comment"></span> </div>
<div class="line"><a id="l00250" name="l00250"></a><span class="lineno">  250</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00251" name="l00251"></a><span class="lineno">  251</span><span class="comment">   * Enables or disables packet pacing, which attempts to spread out, without sacrificing overall</span></div>
<div class="line"><a id="l00252" name="l00252"></a><span class="lineno">  252</span><span class="comment">   * send throughput, outgoing low-level packets to prevent loss.  If disabled, any packet that is</span></div>
<div class="line"><a id="l00253" name="l00253"></a><span class="lineno">  253</span><span class="comment">   * allowed by congestion/flow control to be sent over the wire is immediately sent to the UDP</span></div>
<div class="line"><a id="l00254" name="l00254"></a><span class="lineno">  254</span><span class="comment">   * net-stack; so for example if 200 packets are ready to send and are allowed to be sent, they&#39;re sent</span></div>
<div class="line"><a id="l00255" name="l00255"></a><span class="lineno">  255</span><span class="comment">   * at the same time.  If enabled, they will be spread out over a reasonable time period instead.</span></div>
<div class="line"><a id="l00256" name="l00256"></a><span class="lineno">  256</span><span class="comment">   * Excessive burstiness can lead to major packet drops, so this can really help.</span></div>
<div class="line"><a id="l00257" name="l00257"></a><span class="lineno">  257</span><span class="comment">   */</span></div>
<div class="line"><a id="l00258" name="l00258"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7cbcdd64a4366740ff9e55b39c977ba">  258</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7cbcdd64a4366740ff9e55b39c977ba">m_st_snd_pacing_enabled</a>;</div>
<div class="line"><a id="l00259" name="l00259"></a><span class="lineno">  259</span><span class="comment"></span> </div>
<div class="line"><a id="l00260" name="l00260"></a><span class="lineno">  260</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00261" name="l00261"></a><span class="lineno">  261</span><span class="comment">   * When estimating the available send bandwidth, each sample must be compiled over at least this</span></div>
<div class="line"><a id="l00262" name="l00262"></a><span class="lineno">  262</span><span class="comment">   * long of a time period, even if the SRTT is lower.  Normally a sample is collected over at</span></div>
<div class="line"><a id="l00263" name="l00263"></a><span class="lineno">  263</span><span class="comment">   * least an SRTT, but computing a bandwidth sample over a quite short time period can produce</span></div>
<div class="line"><a id="l00264" name="l00264"></a><span class="lineno">  264</span><span class="comment">   * funky results, hence this floor.  Send bandwidth estimation is used at least for some forms of</span></div>
<div class="line"><a id="l00265" name="l00265"></a><span class="lineno">  265</span><span class="comment">   * congestion control.</span></div>
<div class="line"><a id="l00266" name="l00266"></a><span class="lineno">  266</span><span class="comment">   */</span></div>
<div class="line"><a id="l00267" name="l00267"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a3d420992e19e5addb7193d607e82e4">  267</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a3d420992e19e5addb7193d607e82e4">m_st_snd_bandwidth_est_sample_period_floor</a>;</div>
<div class="line"><a id="l00268" name="l00268"></a><span class="lineno">  268</span><span class="comment"></span> </div>
<div class="line"><a id="l00269" name="l00269"></a><span class="lineno">  269</span><span class="comment">  /// The congestion control algorithm to use for the connection or connections.</span></div>
<div class="line"><a id="l00270" name="l00270"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aca69056d3029193823f0c0ae630f5759">  270</a></span><span class="comment"></span>  <a class="code hl_enumeration" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">Congestion_control_strategy_choice</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aca69056d3029193823f0c0ae630f5759">m_st_cong_ctl_strategy</a>;</div>
<div class="line"><a id="l00271" name="l00271"></a><span class="lineno">  271</span><span class="comment"></span> </div>
<div class="line"><a id="l00272" name="l00272"></a><span class="lineno">  272</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00273" name="l00273"></a><span class="lineno">  273</span><span class="comment">   * The initial size of the congestion window, given in units of max-block-size-sized blocks.</span></div>
<div class="line"><a id="l00274" name="l00274"></a><span class="lineno">  274</span><span class="comment">   * The special value 0 means RFC 5681&#39;s automatic max-block-size-based computation should</span></div>
<div class="line"><a id="l00275" name="l00275"></a><span class="lineno">  275</span><span class="comment">   * be used instead.</span></div>
<div class="line"><a id="l00276" name="l00276"></a><span class="lineno">  276</span><span class="comment">   */</span></div>
<div class="line"><a id="l00277" name="l00277"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a637811d19d4a2b4d9b3ab79742aadff8">  277</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a637811d19d4a2b4d9b3ab79742aadff8">m_st_cong_ctl_init_cong_wnd_blocks</a>;</div>
<div class="line"><a id="l00278" name="l00278"></a><span class="lineno">  278</span><span class="comment"></span> </div>
<div class="line"><a id="l00279" name="l00279"></a><span class="lineno">  279</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00280" name="l00280"></a><span class="lineno">  280</span><span class="comment">   * The constant that determines the CWND limit in Congestion_control_classic_data::congestion_window_at_limit() and</span></div>
<div class="line"><a id="l00281" name="l00281"></a><span class="lineno">  281</span><span class="comment">   * Congestion_control_classic_data::clamp_congestion_window() (in multiples of max-block-size).  When choosing this</span></div>
<div class="line"><a id="l00282" name="l00282"></a><span class="lineno">  282</span><span class="comment">   * value, use these constraints:</span></div>
<div class="line"><a id="l00283" name="l00283"></a><span class="lineno">  283</span><span class="comment">   *</span></div>
<div class="line"><a id="l00284" name="l00284"></a><span class="lineno">  284</span><span class="comment">   *   - This limits total outgoing throughput.  The throughput B will be &lt;= CWND/RTT, where RTT is</span></div>
<div class="line"><a id="l00285" name="l00285"></a><span class="lineno">  285</span><span class="comment">   *     roughly the RTT of the connection, and CWND == max-cong-wnd-blocks * max-block-size.</span></div>
<div class="line"><a id="l00286" name="l00286"></a><span class="lineno">  286</span><span class="comment">   *     Therefore, choose B and RTT values and set max-cong-wnd-blocks = B * RTT / max-block-size</span></div>
<div class="line"><a id="l00287" name="l00287"></a><span class="lineno">  287</span><span class="comment">   *     (B in bytes/second, RTT in seconds).</span></div>
<div class="line"><a id="l00288" name="l00288"></a><span class="lineno">  288</span><span class="comment">   *   - Until we implement Receive window, this value should be much (say, 4x) less than the size</span></div>
<div class="line"><a id="l00289" name="l00289"></a><span class="lineno">  289</span><span class="comment">   *     of the Receive buffer, to avoid situations where even a well-behaving user (i.e., user that</span></div>
<div class="line"><a id="l00290" name="l00290"></a><span class="lineno">  290</span><span class="comment">   *     `receive()`s all data ASAP) cannot keep up with reading data off Receive buffer, forcing</span></div>
<div class="line"><a id="l00291" name="l00291"></a><span class="lineno">  291</span><span class="comment">   *     `net_flow` to drop large swaths of incoming traffic.  If CWND is much smaller than Receive</span></div>
<div class="line"><a id="l00292" name="l00292"></a><span class="lineno">  292</span><span class="comment">   *     buffer size, then this avoids that problem.</span></div>
<div class="line"><a id="l00293" name="l00293"></a><span class="lineno">  293</span><span class="comment">   *</span></div>
<div class="line"><a id="l00294" name="l00294"></a><span class="lineno">  294</span><span class="comment">   * @todo Reconsider this value after Receive window feature is implemented.</span></div>
<div class="line"><a id="l00295" name="l00295"></a><span class="lineno">  295</span><span class="comment">   */</span></div>
<div class="line"><a id="l00296" name="l00296"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a1bdc21e84373dd96494a76f11603335e">  296</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a1bdc21e84373dd96494a76f11603335e">m_st_cong_ctl_max_cong_wnd_blocks</a>;</div>
<div class="line"><a id="l00297" name="l00297"></a><span class="lineno">  297</span><span class="comment"></span> </div>
<div class="line"><a id="l00298" name="l00298"></a><span class="lineno">  298</span><span class="comment">  /// On Drop Timeout, set congestion window to this value times max-block-size.</span></div>
<div class="line"><a id="l00299" name="l00299"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2c8fcb08dfb0d1ebcc21e02940c149e8">  299</a></span><span class="comment"></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2c8fcb08dfb0d1ebcc21e02940c149e8">m_st_cong_ctl_cong_wnd_on_drop_timeout_blocks</a>;</div>
<div class="line"><a id="l00300" name="l00300"></a><span class="lineno">  300</span><span class="comment"></span> </div>
<div class="line"><a id="l00301" name="l00301"></a><span class="lineno">  301</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00302" name="l00302"></a><span class="lineno">  302</span><span class="comment">   * The multiple of max-block-size by which to increment CWND in congestion avoidance mode after receiving</span></div>
<div class="line"><a id="l00303" name="l00303"></a><span class="lineno">  303</span><span class="comment">   * at least a full CWND&#39;s worth of clean acknowledgments.  RFC 5681 (classic Reno) mandates this is set to 1,</span></div>
<div class="line"><a id="l00304" name="l00304"></a><span class="lineno">  304</span><span class="comment">   * but we allow it to be overridden.  The special value 0 causes the RFC value to be used.</span></div>
<div class="line"><a id="l00305" name="l00305"></a><span class="lineno">  305</span><span class="comment">   */</span></div>
<div class="line"><a id="l00306" name="l00306"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a7ab1e27acd52d8fa3aadc9eb13d116">  306</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a7ab1e27acd52d8fa3aadc9eb13d116">m_st_cong_ctl_cong_avoidance_increment_blocks</a>;</div>
<div class="line"><a id="l00307" name="l00307"></a><span class="lineno">  307</span><span class="comment"></span> </div>
<div class="line"><a id="l00308" name="l00308"></a><span class="lineno">  308</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00309" name="l00309"></a><span class="lineno">  309</span><span class="comment">   * In classic congestion control, RFC 5681 specifies the window should be halved on loss; this</span></div>
<div class="line"><a id="l00310" name="l00310"></a><span class="lineno">  310</span><span class="comment">   * option allows one to use a custom percentage instead.  This should be a value in [1, 100] to</span></div>
<div class="line"><a id="l00311" name="l00311"></a><span class="lineno">  311</span><span class="comment">   * have the window decay to that percentage of its previous value, or 0 to use the RFC</span></div>
<div class="line"><a id="l00312" name="l00312"></a><span class="lineno">  312</span><span class="comment">   * 5681-recommended constant (50).</span></div>
<div class="line"><a id="l00313" name="l00313"></a><span class="lineno">  313</span><span class="comment">   */</span></div>
<div class="line"><a id="l00314" name="l00314"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeccfe97128c9f5f62ff26d73047dec2e">  314</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeccfe97128c9f5f62ff26d73047dec2e">m_st_cong_ctl_classic_wnd_decay_percent</a>;</div>
<div class="line"><a id="l00315" name="l00315"></a><span class="lineno">  315</span><span class="comment"></span> </div>
<div class="line"><a id="l00316" name="l00316"></a><span class="lineno">  316</span><span class="comment">  /// Ceiling to impose on the Drop Timeout.</span></div>
<div class="line"><a id="l00317" name="l00317"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#afd02a9d91ef5e5c13ea95ea35624da1a">  317</a></span><span class="comment"></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#afd02a9d91ef5e5c13ea95ea35624da1a">m_dyn_drop_timeout_ceiling</a>;</div>
<div class="line"><a id="l00318" name="l00318"></a><span class="lineno">  318</span><span class="comment"></span> </div>
<div class="line"><a id="l00319" name="l00319"></a><span class="lineno">  319</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00320" name="l00320"></a><span class="lineno">  320</span><span class="comment">   * Whenever the Drop Timer fires, upon the requisite Dropping of packet(s), the DTO (Drop Timeout)</span></div>
<div class="line"><a id="l00321" name="l00321"></a><span class="lineno">  321</span><span class="comment">   * is set to its current value times this factor, and then the timer is rescheduled accordingly.</span></div>
<div class="line"><a id="l00322" name="l00322"></a><span class="lineno">  322</span><span class="comment">   * RFC 6298 recommends 2.  Another value might be 1 (disable feature).  The lower the more</span></div>
<div class="line"><a id="l00323" name="l00323"></a><span class="lineno">  323</span><span class="comment">   * aggressive.</span></div>
<div class="line"><a id="l00324" name="l00324"></a><span class="lineno">  324</span><span class="comment">   */</span></div>
<div class="line"><a id="l00325" name="l00325"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae2551f2995f5830e0461bec6fdd9035e">  325</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae2551f2995f5830e0461bec6fdd9035e">m_dyn_drop_timeout_backoff_factor</a>;</div>
<div class="line"><a id="l00326" name="l00326"></a><span class="lineno">  326</span><span class="comment"></span> </div>
<div class="line"><a id="l00327" name="l00327"></a><span class="lineno">  327</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00328" name="l00328"></a><span class="lineno">  328</span><span class="comment">   * When the mode triggered by rcv-buf-max-size-to-advertise-percent being exceeded is in effect,</span></div>
<div class="line"><a id="l00329" name="l00329"></a><span class="lineno">  329</span><span class="comment">   * to counteract the possibility of ACK loss the receive window is periodically advertised</span></div>
<div class="line"><a id="l00330" name="l00330"></a><span class="lineno">  330</span><span class="comment">   * subsequently -- with the period given by this option -- until either some new data arrive or</span></div>
<div class="line"><a id="l00331" name="l00331"></a><span class="lineno">  331</span><span class="comment">   * rcv-wnd-recovery-max-period is exceeded.</span></div>
<div class="line"><a id="l00332" name="l00332"></a><span class="lineno">  332</span><span class="comment">   */</span></div>
<div class="line"><a id="l00333" name="l00333"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac38c0bbba5edbb4964a3914ccf56018f">  333</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac38c0bbba5edbb4964a3914ccf56018f">m_dyn_rcv_wnd_recovery_timer_period</a>;</div>
<div class="line"><a id="l00334" name="l00334"></a><span class="lineno">  334</span><span class="comment"></span> </div>
<div class="line"><a id="l00335" name="l00335"></a><span class="lineno">  335</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00336" name="l00336"></a><span class="lineno">  336</span><span class="comment">   * Approximate amount of time since the beginning of rcv_wnd recovery due to</span></div>
<div class="line"><a id="l00337" name="l00337"></a><span class="lineno">  337</span><span class="comment">   * rcv-buf-max-size-to-advertise-percent until we give up and end that phase.</span></div>
<div class="line"><a id="l00338" name="l00338"></a><span class="lineno">  338</span><span class="comment">   */</span></div>
<div class="line"><a id="l00339" name="l00339"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a371e3340cecf792f0fd815b55dd25f60">  339</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a371e3340cecf792f0fd815b55dd25f60">m_dyn_rcv_wnd_recovery_max_period</a>;</div>
<div class="line"><a id="l00340" name="l00340"></a><span class="lineno">  340</span> </div>
<div class="line"><a id="l00341" name="l00341"></a><span class="lineno">  341</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00342" name="l00342"></a><span class="lineno">  342</span>  <span class="comment">// Friends.</span></div>
<div class="line"><a id="l00343" name="l00343"></a><span class="lineno">  343</span><span class="comment"></span> </div>
<div class="line"><a id="l00344" name="l00344"></a><span class="lineno">  344</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00345" name="l00345"></a><span class="lineno">  345</span><span class="comment">   * The two `struct`s work together (since Node_options contains an instance of us).</span></div>
<div class="line"><a id="l00346" name="l00346"></a><span class="lineno">  346</span><span class="comment">   * @see Node_options.</span></div>
<div class="line"><a id="l00347" name="l00347"></a><span class="lineno">  347</span><span class="comment">   */</span></div>
<div class="line"><a id="l00348" name="l00348"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ade95ba3f5a7ed233a2e5f9e244ed6170">  348</a></span>  <span class="keyword">friend</span> <span class="keyword">struct </span><a class="code hl_struct" href="structflow_1_1net__flow_1_1Node__options.html">Node_options</a>;</div>
<div class="line"><a id="l00349" name="l00349"></a><span class="lineno">  349</span>  <span class="comment">// Friend of Peer_socket_options: For access to our internals.</span></div>
<div class="line"><a id="l00350" name="l00350"></a><span class="lineno">  350</span>  <span class="keyword">friend</span> std::ostream&amp; <a class="code hl_friend" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a3954beff8f73e2d6f566f4e15c30219c">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a>&amp; opts);</div>
<div class="line"><a id="l00351" name="l00351"></a><span class="lineno">  351</span> </div>
<div class="line"><a id="l00352" name="l00352"></a><span class="lineno">  352</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00353" name="l00353"></a><span class="lineno">  353</span><span class="comment"></span> </div>
<div class="line"><a id="l00354" name="l00354"></a><span class="lineno">  354</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00355" name="l00355"></a><span class="lineno">  355</span><span class="comment">   * Analogous to Node_options::setup_config_parsing_helper().  See that method.</span></div>
<div class="line"><a id="l00356" name="l00356"></a><span class="lineno">  356</span><span class="comment">   *</span></div>
<div class="line"><a id="l00357" name="l00357"></a><span class="lineno">  357</span><span class="comment">   * @param opts_desc</span></div>
<div class="line"><a id="l00358" name="l00358"></a><span class="lineno">  358</span><span class="comment">   *        See Node_options::setup_config_parsing_helper().</span></div>
<div class="line"><a id="l00359" name="l00359"></a><span class="lineno">  359</span><span class="comment">   * @param target</span></div>
<div class="line"><a id="l00360" name="l00360"></a><span class="lineno">  360</span><span class="comment">   *        See Node_options::setup_config_parsing_helper().</span></div>
<div class="line"><a id="l00361" name="l00361"></a><span class="lineno">  361</span><span class="comment">   * @param defaults_source</span></div>
<div class="line"><a id="l00362" name="l00362"></a><span class="lineno">  362</span><span class="comment">   *        See Node_options::setup_config_parsing_helper().</span></div>
<div class="line"><a id="l00363" name="l00363"></a><span class="lineno">  363</span><span class="comment">   * @param printout_only</span></div>
<div class="line"><a id="l00364" name="l00364"></a><span class="lineno">  364</span><span class="comment">   *        See Node_options::setup_config_parsing_helper().</span></div>
<div class="line"><a id="l00365" name="l00365"></a><span class="lineno">  365</span><span class="comment">   */</span></div>
<div class="line"><a id="l00366" name="l00366"></a><span class="lineno">  366</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad0015d953f3079a326ba6dce5d0bff89">setup_config_parsing_helper</a>(<a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">Options_description</a>* opts_desc,</div>
<div class="line"><a id="l00367" name="l00367"></a><span class="lineno">  367</span>                                          <a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a>* target,</div>
<div class="line"><a id="l00368" name="l00368"></a><span class="lineno">  368</span>                                          <span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a>&amp; defaults_source,</div>
<div class="line"><a id="l00369" name="l00369"></a><span class="lineno">  369</span>                                          <span class="keywordtype">bool</span> printout_only);</div>
<div class="line"><a id="l00370" name="l00370"></a><span class="lineno">  370</span>}; <span class="comment">// struct Peer_socket_options</span></div>
<div class="line"><a id="l00371" name="l00371"></a><span class="lineno">  371</span><span class="comment"></span> </div>
<div class="line"><a id="l00372" name="l00372"></a><span class="lineno">  372</span><span class="comment">/**</span></div>
<div class="line"><a id="l00373" name="l00373"></a><span class="lineno">  373</span><span class="comment"> * A set of low-level options affecting a single Flow Node, including Peer_socket objects and other</span></div>
<div class="line"><a id="l00374" name="l00374"></a><span class="lineno">  374</span><span class="comment"> * objects subsequently generated by that Flow Node.  Typically these values can be left at</span></div>
<div class="line"><a id="l00375" name="l00375"></a><span class="lineno">  375</span><span class="comment"> * defaults, and thus the `net_flow` user normally need not deal with these objects.  However, if</span></div>
<div class="line"><a id="l00376" name="l00376"></a><span class="lineno">  376</span><span class="comment"> * low-level tuning of Flow internals is needed, you can use this `struct`.</span></div>
<div class="line"><a id="l00377" name="l00377"></a><span class="lineno">  377</span><span class="comment"> *</span></div>
<div class="line"><a id="l00378" name="l00378"></a><span class="lineno">  378</span><span class="comment"> * This is just a simple `struct` with a couple of utilities to serialize (to `ostream`) and deserialize</span></div>
<div class="line"><a id="l00379" name="l00379"></a><span class="lineno">  379</span><span class="comment"> * (from a config file or command line) the values in the `struct`; it is not connected to any other</span></div>
<div class="line"><a id="l00380" name="l00380"></a><span class="lineno">  380</span><span class="comment"> * object (for example, it can exist with no Node).</span></div>
<div class="line"><a id="l00381" name="l00381"></a><span class="lineno">  381</span><span class="comment"> *</span></div>
<div class="line"><a id="l00382" name="l00382"></a><span class="lineno">  382</span><span class="comment"> * You may read from and write to members of this `struct` at will, and no checking will be performed;</span></div>
<div class="line"><a id="l00383" name="l00383"></a><span class="lineno">  383</span><span class="comment"> * moreover, doing so will have no effect other than the field being read or written.</span></div>
<div class="line"><a id="l00384" name="l00384"></a><span class="lineno">  384</span><span class="comment"> *</span></div>
<div class="line"><a id="l00385" name="l00385"></a><span class="lineno">  385</span><span class="comment"> * Fields are validated and potentially take effect, however, when you pass a Node_options object</span></div>
<div class="line"><a id="l00386" name="l00386"></a><span class="lineno">  386</span><span class="comment"> * to Node.  Node always copies the given Node_options and never saves a reference to it.  All of</span></div>
<div class="line"><a id="l00387" name="l00387"></a><span class="lineno">  387</span><span class="comment"> * that applies equally to Peer_socket_options.</span></div>
<div class="line"><a id="l00388" name="l00388"></a><span class="lineno">  388</span><span class="comment"> *</span></div>
<div class="line"><a id="l00389" name="l00389"></a><span class="lineno">  389</span><span class="comment"> * Node_options contains a Peer_socket_options #m_dyn_sock_opts (a very similar, in spirit, `struct`)</span></div>
<div class="line"><a id="l00390" name="l00390"></a><span class="lineno">  390</span><span class="comment"> * within it.  Options stored within that are per-::flow::net_flow::Peer_socket</span></div>
<div class="line"><a id="l00391" name="l00391"></a><span class="lineno">  391</span><span class="comment"> * options.  For example, #m_st_low_lvl_max_buf_size</span></div>
<div class="line"><a id="l00392" name="l00392"></a><span class="lineno">  392</span><span class="comment"> * applies to the entire Node at all times and is stored directly in `*this` (as there is only one</span></div>
<div class="line"><a id="l00393" name="l00393"></a><span class="lineno">  393</span><span class="comment"> * UDP buffer for the entire Node); whereas max-block-size can be different for each</span></div>
<div class="line"><a id="l00394" name="l00394"></a><span class="lineno">  394</span><span class="comment"> * individual Peer_socket and is thus stored in `this-&gt;m_dyn_sock_opts`.  See Node::listen() and</span></div>
<div class="line"><a id="l00395" name="l00395"></a><span class="lineno">  395</span><span class="comment"> * Node::connect() for how per-socket options are distributed to subsequent sockets as connections</span></div>
<div class="line"><a id="l00396" name="l00396"></a><span class="lineno">  396</span><span class="comment"> * are made.</span></div>
<div class="line"><a id="l00397" name="l00397"></a><span class="lineno">  397</span><span class="comment"> *</span></div>
<div class="line"><a id="l00398" name="l00398"></a><span class="lineno">  398</span><span class="comment"> * The `struct`, when default-constructed, contains sane default values as used by Node when not</span></div>
<div class="line"><a id="l00399" name="l00399"></a><span class="lineno">  399</span><span class="comment"> * provided with a Node_options object.  Alternatively, you can get a Node&#39;s existing set of</span></div>
<div class="line"><a id="l00400" name="l00400"></a><span class="lineno">  400</span><span class="comment"> * options via Node::options().</span></div>
<div class="line"><a id="l00401" name="l00401"></a><span class="lineno">  401</span><span class="comment"> *</span></div>
<div class="line"><a id="l00402" name="l00402"></a><span class="lineno">  402</span><span class="comment"> * After obtaining a Node_options either way, you may assign values to it manually.</span></div>
<div class="line"><a id="l00403" name="l00403"></a><span class="lineno">  403</span><span class="comment"> *</span></div>
<div class="line"><a id="l00404" name="l00404"></a><span class="lineno">  404</span><span class="comment"> * Alternatively, you can fill it parsing a config file or command line using</span></div>
<div class="line"><a id="l00405" name="l00405"></a><span class="lineno">  405</span><span class="comment"> * boost.program_options (which makes it a snap) with the help of</span></div>
<div class="line"><a id="l00406" name="l00406"></a><span class="lineno">  406</span><span class="comment"> * Node_options::setup_config_parsing(), which will provide a program_options-suitable</span></div>
<div class="line"><a id="l00407" name="l00407"></a><span class="lineno">  407</span><span class="comment"> * #Options_description object to enable this parsing.  You may conversely print #Options_description</span></div>
<div class="line"><a id="l00408" name="l00408"></a><span class="lineno">  408</span><span class="comment"> * to an `ostream` (e.g., `cout`) for full help text on the meaning of each option and the defaults.</span></div>
<div class="line"><a id="l00409" name="l00409"></a><span class="lineno">  409</span><span class="comment"> *</span></div>
<div class="line"><a id="l00410" name="l00410"></a><span class="lineno">  410</span><span class="comment"> * You may also print a filled Node_options itself to an `ostream` for the current settings stored in</span></div>
<div class="line"><a id="l00411" name="l00411"></a><span class="lineno">  411</span><span class="comment"> * that object.</span></div>
<div class="line"><a id="l00412" name="l00412"></a><span class="lineno">  412</span><span class="comment"> *</span></div>
<div class="line"><a id="l00413" name="l00413"></a><span class="lineno">  413</span><span class="comment"> * ### Thready safety ###</span></div>
<div class="line"><a id="l00414" name="l00414"></a><span class="lineno">  414</span><span class="comment"> * Same as any `struct` with no locking done therein.</span></div>
<div class="line"><a id="l00415" name="l00415"></a><span class="lineno">  415</span><span class="comment"> *</span></div>
<div class="line"><a id="l00416" name="l00416"></a><span class="lineno">  416</span><span class="comment"> * @see Node constructor, Node::set_options(), Node::listen(), Node::connect().</span></div>
<div class="line"><a id="l00417" name="l00417"></a><span class="lineno">  417</span><span class="comment"> * @see Peer_socket::set_options(), Peer_socket::options().</span></div>
<div class="line"><a id="l00418" name="l00418"></a><span class="lineno">  418</span><span class="comment"> * @see Peer_socket_options.</span></div>
<div class="line"><a id="l00419" name="l00419"></a><span class="lineno">  419</span><span class="comment"> *</span></div>
<div class="line"><a id="l00420" name="l00420"></a><span class="lineno">  420</span><span class="comment"> * @internal</span></div>
<div class="line"><a id="l00421" name="l00421"></a><span class="lineno">  421</span><span class="comment"> *</span></div>
<div class="line"><a id="l00422" name="l00422"></a><span class="lineno">  422</span><span class="comment"> * If you want to add an option, follow these steps:</span></div>
<div class="line"><a id="l00423" name="l00423"></a><span class="lineno">  423</span><span class="comment"> *</span></div>
<div class="line"><a id="l00424" name="l00424"></a><span class="lineno">  424</span><span class="comment"> *   1. Decide whether it&#39;s a per-socket or per-Node option (usually the former) and add it to</span></div>
<div class="line"><a id="l00425" name="l00425"></a><span class="lineno">  425</span><span class="comment"> *      Peer_socket_options or Node_options, respectively, using the below steps.</span></div>
<div class="line"><a id="l00426" name="l00426"></a><span class="lineno">  426</span><span class="comment"> *   2. Decide whether the option&#39;s value may be changed after the enclosing Node_options or</span></div>
<div class="line"><a id="l00427" name="l00427"></a><span class="lineno">  427</span><span class="comment"> *      Peer_socket_options has been accepted by a running Node or Peer_socket, respectively.  Most</span></div>
<div class="line"><a id="l00428" name="l00428"></a><span class="lineno">  428</span><span class="comment"> *      options tend to be static (cannot be changed once a Node or Peer_socket has accepted them).</span></div>
<div class="line"><a id="l00429" name="l00429"></a><span class="lineno">  429</span><span class="comment"> *      Based on this, the data member must start with `m_st_` (static) or `m_dyn_` (dynamic).  Choose</span></div>
<div class="line"><a id="l00430" name="l00430"></a><span class="lineno">  430</span><span class="comment"> *      the rest of the member name as well.</span></div>
<div class="line"><a id="l00431" name="l00431"></a><span class="lineno">  431</span><span class="comment"> *   3. Add the data member into the chosen `struct`.  Fully comment the meaning, as for other</span></div>
<div class="line"><a id="l00432" name="l00432"></a><span class="lineno">  432</span><span class="comment"> *      present options.</span></div>
<div class="line"><a id="l00433" name="l00433"></a><span class="lineno">  433</span><span class="comment"> *   4. Add an ADD_CONFIG_OPTION() line into the proper `struct` setup_config_parsing_helper() by analogy</span></div>
<div class="line"><a id="l00434" name="l00434"></a><span class="lineno">  434</span><span class="comment"> *      with other present options.  The description string should usually be a copy of the comment</span></div>
<div class="line"><a id="l00435" name="l00435"></a><span class="lineno">  435</span><span class="comment"> *      from step 3.</span></div>
<div class="line"><a id="l00436" name="l00436"></a><span class="lineno">  436</span><span class="comment"> *   5. Add the default value (very important) into the the proper `struct` constructor.</span></div>
<div class="line"><a id="l00437" name="l00437"></a><span class="lineno">  437</span><span class="comment"> *      Explain the choice of default with a comment.</span></div>
<div class="line"><a id="l00438" name="l00438"></a><span class="lineno">  438</span><span class="comment"> *   6. Is this a static option (step 2)?  If so, add static validation (by analogy with present</span></div>
<div class="line"><a id="l00439" name="l00439"></a><span class="lineno">  439</span><span class="comment"> *      options) to Node::validate_options() or Node::sock_validate_options().</span></div>
<div class="line"><a id="l00440" name="l00440"></a><span class="lineno">  440</span><span class="comment"> *   7. Add semantic validation (such as for illegal values, including illegal values due to</span></div>
<div class="line"><a id="l00441" name="l00441"></a><span class="lineno">  441</span><span class="comment"> *      inconsistency with other option values) to Node::validate_options() or</span></div>
<div class="line"><a id="l00442" name="l00442"></a><span class="lineno">  442</span><span class="comment"> *      Node::sock_validate_options().  For some options all values are legal, in which case you</span></div>
<div class="line"><a id="l00443" name="l00443"></a><span class="lineno">  443</span><span class="comment"> *      needn&#39;t add anything.</span></div>
<div class="line"><a id="l00444" name="l00444"></a><span class="lineno">  444</span><span class="comment"> *   8. Use the option.  EVERY read of the option should be performed through Node::opt() or</span></div>
<div class="line"><a id="l00445" name="l00445"></a><span class="lineno">  445</span><span class="comment"> *      Peer_socket::opt(), for thread safety.  The only exception is if you manually lock</span></div>
<div class="line"><a id="l00446" name="l00446"></a><span class="lineno">  446</span><span class="comment"> *      Node::m_opt_mutex or Peer_socket::m_opt_mutex, respectively.</span></div>
<div class="line"><a id="l00447" name="l00447"></a><span class="lineno">  447</span><span class="comment"> */</span></div>
<div class="line"><a id="l00448" name="l00448"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html">  448</a></span><span class="keyword">struct </span><a class="code hl_struct" href="structflow_1_1net__flow_1_1Node__options.html">Node_options</a></div>
<div class="line"><a id="l00449" name="l00449"></a><span class="lineno">  449</span>{</div>
<div class="line"><a id="l00450" name="l00450"></a><span class="lineno">  450</span>  <span class="comment">// Types.</span></div>
<div class="line"><a id="l00451" name="l00451"></a><span class="lineno">  451</span><span class="comment"></span> </div>
<div class="line"><a id="l00452" name="l00452"></a><span class="lineno">  452</span><span class="comment">  /// Short-hand for boost.program_options config options description.  See setup_config_parsing().</span></div>
<div class="line"><a id="l00453" name="l00453"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">  453</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">Options_description</a> = <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">Peer_socket_options::Options_description</a>;</div>
<div class="line"><a id="l00454" name="l00454"></a><span class="lineno">  454</span><span class="comment"></span> </div>
<div class="line"><a id="l00455" name="l00455"></a><span class="lineno">  455</span><span class="comment">  /// A time duration, with fine precision.</span></div>
<div class="line"><a id="l00456" name="l00456"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a6733e4efbec3ed97b2460bf50d7cc67c">  456</a></span><span class="comment"></span>  <span class="keyword">using </span><a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#a6733e4efbec3ed97b2460bf50d7cc67c">Fine_duration</a> = <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">Peer_socket_options::Fine_duration</a>;</div>
<div class="line"><a id="l00457" name="l00457"></a><span class="lineno">  457</span> </div>
<div class="line"><a id="l00458" name="l00458"></a><span class="lineno">  458</span>  <span class="comment">// Constructors/destructor.</span></div>
<div class="line"><a id="l00459" name="l00459"></a><span class="lineno">  459</span><span class="comment"></span> </div>
<div class="line"><a id="l00460" name="l00460"></a><span class="lineno">  460</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00461" name="l00461"></a><span class="lineno">  461</span><span class="comment">   * Constructs a Node_options with values equal to those used by Node when the Node</span></div>
<div class="line"><a id="l00462" name="l00462"></a><span class="lineno">  462</span><span class="comment">   * creator chooses not to supply custom options.</span></div>
<div class="line"><a id="l00463" name="l00463"></a><span class="lineno">  463</span><span class="comment">   */</span></div>
<div class="line"><a id="l00464" name="l00464"></a><span class="lineno">  464</span>  <span class="keyword">explicit</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Node__options.html#a5e19fc9671473ace300d457f7334dc31">Node_options</a>();</div>
<div class="line"><a id="l00465" name="l00465"></a><span class="lineno">  465</span> </div>
<div class="line"><a id="l00466" name="l00466"></a><span class="lineno">  466</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00467" name="l00467"></a><span class="lineno">  467</span><span class="comment"></span> </div>
<div class="line"><a id="l00468" name="l00468"></a><span class="lineno">  468</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00469" name="l00469"></a><span class="lineno">  469</span><span class="comment">   * Modifies a boost.program_options options description object to enable subsequent parsing of a</span></div>
<div class="line"><a id="l00470" name="l00470"></a><span class="lineno">  470</span><span class="comment">   * command line or config file into the data members of this object, as well printing a help</span></div>
<div class="line"><a id="l00471" name="l00471"></a><span class="lineno">  471</span><span class="comment">   * message about these options to an `ostream`.  In particular, after executing this method:</span></div>
<div class="line"><a id="l00472" name="l00472"></a><span class="lineno">  472</span><span class="comment">   *</span></div>
<div class="line"><a id="l00473" name="l00473"></a><span class="lineno">  473</span><span class="comment">   *   - If you output `*opts_desc` to an `ostream`, the `ostream` will get a detailed description of each</span></div>
<div class="line"><a id="l00474" name="l00474"></a><span class="lineno">  474</span><span class="comment">   *     option, its symbolic name (for config file or command line), and its value if the config</span></div>
<div class="line"><a id="l00475" name="l00475"></a><span class="lineno">  475</span><span class="comment">   *     file or command line omits this option (the default).  This default will equal to the value</span></div>
<div class="line"><a id="l00476" name="l00476"></a><span class="lineno">  476</span><span class="comment">   *     of that particular option in a default-constructed Node_options.</span></div>
<div class="line"><a id="l00477" name="l00477"></a><span class="lineno">  477</span><span class="comment">   *</span></div>
<div class="line"><a id="l00478" name="l00478"></a><span class="lineno">  478</span><span class="comment">   *   - If you perform something like the following code snippet,</span></div>
<div class="line"><a id="l00479" name="l00479"></a><span class="lineno">  479</span><span class="comment">   *     then `*this` will now be filled with values parsed from `ifstream F` (and default values</span></div>
<div class="line"><a id="l00480" name="l00480"></a><span class="lineno">  480</span><span class="comment">   *     for any omitted values):</span></div>
<div class="line"><a id="l00481" name="l00481"></a><span class="lineno">  481</span><span class="comment">   *</span></div>
<div class="line"><a id="l00482" name="l00482"></a><span class="lineno">  482</span><span class="comment">   *   ~~~</span></div>
<div class="line"><a id="l00483" name="l00483"></a><span class="lineno">  483</span><span class="comment">   *   namespace opts = boost::program_options;</span></div>
<div class="line"><a id="l00484" name="l00484"></a><span class="lineno">  484</span><span class="comment">   *   Node_options flow_opts;</span></div>
<div class="line"><a id="l00485" name="l00485"></a><span class="lineno">  485</span><span class="comment">   *   opts::options_description opts_desc;</span></div>
<div class="line"><a id="l00486" name="l00486"></a><span class="lineno">  486</span><span class="comment">   *   std::ifstream F(...);</span></div>
<div class="line"><a id="l00487" name="l00487"></a><span class="lineno">  487</span><span class="comment">   *   flow_opts.setup_config_parsing(&amp;opts_desc);</span></div>
<div class="line"><a id="l00488" name="l00488"></a><span class="lineno">  488</span><span class="comment">   *   opts::variables_map cfg_vars;</span></div>
<div class="line"><a id="l00489" name="l00489"></a><span class="lineno">  489</span><span class="comment">   *   opts::store(opts::parse_config_file(F, *opts_desc), cfg_vars);</span></div>
<div class="line"><a id="l00490" name="l00490"></a><span class="lineno">  490</span><span class="comment">   *   opts::notify(cfg_vars);</span></div>
<div class="line"><a id="l00491" name="l00491"></a><span class="lineno">  491</span><span class="comment">   *   ~~~</span></div>
<div class="line"><a id="l00492" name="l00492"></a><span class="lineno">  492</span><span class="comment">   *</span></div>
<div class="line"><a id="l00493" name="l00493"></a><span class="lineno">  493</span><span class="comment">   * Note the default values will come from the current values inside `*this`.</span></div>
<div class="line"><a id="l00494" name="l00494"></a><span class="lineno">  494</span><span class="comment">   *</span></div>
<div class="line"><a id="l00495" name="l00495"></a><span class="lineno">  495</span><span class="comment">   * @param opts_desc</span></div>
<div class="line"><a id="l00496" name="l00496"></a><span class="lineno">  496</span><span class="comment">   *        The #Options_description object into which to load the help information, defaults, and</span></div>
<div class="line"><a id="l00497" name="l00497"></a><span class="lineno">  497</span><span class="comment">   *        mapping to members of `*this`.</span></div>
<div class="line"><a id="l00498" name="l00498"></a><span class="lineno">  498</span><span class="comment">   */</span></div>
<div class="line"><a id="l00499" name="l00499"></a><span class="lineno">  499</span>  <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Node__options.html#a5819e60ed58aafb496e39962c89215f1">setup_config_parsing</a>(<a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">Options_description</a>* opts_desc);</div>
<div class="line"><a id="l00500" name="l00500"></a><span class="lineno">  500</span> </div>
<div class="line"><a id="l00501" name="l00501"></a><span class="lineno">  501</span>  <span class="comment">// Data.</span></div>
<div class="line"><a id="l00502" name="l00502"></a><span class="lineno">  502</span><span class="comment"></span> </div>
<div class="line"><a id="l00503" name="l00503"></a><span class="lineno">  503</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00504" name="l00504"></a><span class="lineno">  504</span><span class="comment">   * If and only if this is `true`, the Node will detect SIGINT and SIGTERM (or your OS&#39;s version thereof);</span></div>
<div class="line"><a id="l00505" name="l00505"></a><span class="lineno">  505</span><span class="comment">   * upon seeing such a signal, it will fire Node::interrupt_all_waits(), which will interrupt all</span></div>
<div class="line"><a id="l00506" name="l00506"></a><span class="lineno">  506</span><span class="comment">   * blocking operations, conceptually similarly to POSIX&#39;s `EINTR`.  If this is `true`, the user may register</span></div>
<div class="line"><a id="l00507" name="l00507"></a><span class="lineno">  507</span><span class="comment">   * their own signal handler(s) (for any purpose whatsoever) using `boost::asio::signal_set`. However, behavior</span></div>
<div class="line"><a id="l00508" name="l00508"></a><span class="lineno">  508</span><span class="comment">   * is undefined if the program registers signal handlers via any other API, such as `sigaction()` or `signal()`.</span></div>
<div class="line"><a id="l00509" name="l00509"></a><span class="lineno">  509</span><span class="comment">   * If you need to set up such a non-`signal_set` signal handler, AND you require `EINTR`-like behavior,</span></div>
<div class="line"><a id="l00510" name="l00510"></a><span class="lineno">  510</span><span class="comment">   * then (1) set this option to `false`; (2) trap SIGINT and SIGTERM yourself; (3) in your handlers for the</span></div>
<div class="line"><a id="l00511" name="l00511"></a><span class="lineno">  511</span><span class="comment">   * latter, simply call Node::interrupt_all_waits().  Similarly, if you want custom behavior regarding</span></div>
<div class="line"><a id="l00512" name="l00512"></a><span class="lineno">  512</span><span class="comment">   * Node::interrupt_all_waits(), feel free to call it whenever you want (not necessarily even from a signal</span></div>
<div class="line"><a id="l00513" name="l00513"></a><span class="lineno">  513</span><span class="comment">   * handler), and set this to `false`.  However, if a typical, common-sense behavior is what you&#39;re after -- and either</span></div>
<div class="line"><a id="l00514" name="l00514"></a><span class="lineno">  514</span><span class="comment">   * don&#39;t need additional signal handling or are OK with using `signal_set` for it -- then setting this to `true` is a</span></div>
<div class="line"><a id="l00515" name="l00515"></a><span class="lineno">  515</span><span class="comment">   * good option.</span></div>
<div class="line"><a id="l00516" name="l00516"></a><span class="lineno">  516</span><span class="comment">   */</span></div>
<div class="line"><a id="l00517" name="l00517"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#aea7861f3c7739f8e588293d16a2de447">  517</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#aea7861f3c7739f8e588293d16a2de447">m_st_capture_interrupt_signals_internally</a>;</div>
<div class="line"><a id="l00518" name="l00518"></a><span class="lineno">  518</span><span class="comment"></span> </div>
<div class="line"><a id="l00519" name="l00519"></a><span class="lineno">  519</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00520" name="l00520"></a><span class="lineno">  520</span><span class="comment">   * The max size to ask the OS to set our UDP socket&#39;s receive buffer to in order to minimize loss</span></div>
<div class="line"><a id="l00521" name="l00521"></a><span class="lineno">  521</span><span class="comment">   * if we can&#39;t process datagrams fast enough.  This should be as high as possible while being</span></div>
<div class="line"><a id="l00522" name="l00522"></a><span class="lineno">  522</span><span class="comment">   * &quot;acceptable&quot; in terms of memory.  However, the OS will probably have its own limit</span></div>
<div class="line"><a id="l00523" name="l00523"></a><span class="lineno">  523</span><span class="comment">   * and may well pick a limit that is the minimum of that limit and this value.</span></div>
<div class="line"><a id="l00524" name="l00524"></a><span class="lineno">  524</span><span class="comment">   */</span></div>
<div class="line"><a id="l00525" name="l00525"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a78baaf1a911c8d490a13278422307e8a">  525</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#a78baaf1a911c8d490a13278422307e8a">m_st_low_lvl_max_buf_size</a>;</div>
<div class="line"><a id="l00526" name="l00526"></a><span class="lineno">  526</span><span class="comment"></span> </div>
<div class="line"><a id="l00527" name="l00527"></a><span class="lineno">  527</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00528" name="l00528"></a><span class="lineno">  528</span><span class="comment">   * A time period such that the boost.asio timer implementation for this platform is able to</span></div>
<div class="line"><a id="l00529" name="l00529"></a><span class="lineno">  529</span><span class="comment">   * accurately able to schedule events within this time period or greater.  If you select 0, the</span></div>
<div class="line"><a id="l00530" name="l00530"></a><span class="lineno">  530</span><span class="comment">   * code will decide what this value is based on the platform, but its logic for this may or may not</span></div>
<div class="line"><a id="l00531" name="l00531"></a><span class="lineno">  531</span><span class="comment">   * be correct (actually it will probably be correct but possibly too conservative [large], causing</span></div>
<div class="line"><a id="l00532" name="l00532"></a><span class="lineno">  532</span><span class="comment">   * timer coarseness in mechanisms like the rather critical packet pacing).</span></div>
<div class="line"><a id="l00533" name="l00533"></a><span class="lineno">  533</span><span class="comment">   */</span></div>
<div class="line"><a id="l00534" name="l00534"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#abef8889be34024b07eff3211a3213d5f">  534</a></span>  <a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#a6733e4efbec3ed97b2460bf50d7cc67c">Fine_duration</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#abef8889be34024b07eff3211a3213d5f">m_st_timer_min_period</a>;</div>
<div class="line"><a id="l00535" name="l00535"></a><span class="lineno">  535</span><span class="comment"></span> </div>
<div class="line"><a id="l00536" name="l00536"></a><span class="lineno">  536</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00537" name="l00537"></a><span class="lineno">  537</span><span class="comment">   * The UDP net-stack may deliver 2 or more datagrams to the Flow Node at the same time.  To lower</span></div>
<div class="line"><a id="l00538" name="l00538"></a><span class="lineno">  538</span><span class="comment">   * overhead and increase efficiency, Flow will process all such datagrams -- and any more that</span></div>
<div class="line"><a id="l00539" name="l00539"></a><span class="lineno">  539</span><span class="comment">   * may arrive during this processing -- before preparing any resulting outgoing messages, such as</span></div>
<div class="line"><a id="l00540" name="l00540"></a><span class="lineno">  540</span><span class="comment">   * acknowledgments or more data packets.  In high-speed conditions this may result in excessive</span></div>
<div class="line"><a id="l00541" name="l00541"></a><span class="lineno">  541</span><span class="comment">   * burstiness of outgoing traffic.  This option&#39;s value places a limit on the number of datagrams</span></div>
<div class="line"><a id="l00542" name="l00542"></a><span class="lineno">  542</span><span class="comment">   * to process before constructing and sending any resulting outgoing messages to prevent this</span></div>
<div class="line"><a id="l00543" name="l00543"></a><span class="lineno">  543</span><span class="comment">   * burstiness.  If 0, there is no limit.</span></div>
<div class="line"><a id="l00544" name="l00544"></a><span class="lineno">  544</span><span class="comment">   */</span></div>
<div class="line"><a id="l00545" name="l00545"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a99cb19cf77ac787103ac616f4415eaf9">  545</a></span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#a99cb19cf77ac787103ac616f4415eaf9">m_dyn_max_packets_per_main_loop_iteration</a>;</div>
<div class="line"><a id="l00546" name="l00546"></a><span class="lineno">  546</span><span class="comment"></span> </div>
<div class="line"><a id="l00547" name="l00547"></a><span class="lineno">  547</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00548" name="l00548"></a><span class="lineno">  548</span><span class="comment">   * Any incoming low-level (UDP) packet will be truncated to this size.  This should be well above</span></div>
<div class="line"><a id="l00549" name="l00549"></a><span class="lineno">  549</span><span class="comment">   * per-socket max-block-size (# of bytes of user payload per DATA packet).  There will only be one buffer</span></div>
<div class="line"><a id="l00550" name="l00550"></a><span class="lineno">  550</span><span class="comment">   * of this size in memory at a time, so no need to be too stingy, but on the other hand certain</span></div>
<div class="line"><a id="l00551" name="l00551"></a><span class="lineno">  551</span><span class="comment">   * allocation/deallocation behavior may cause performance drops if this unnecessarily large.</span></div>
<div class="line"><a id="l00552" name="l00552"></a><span class="lineno">  552</span><span class="comment">   */</span></div>
<div class="line"><a id="l00553" name="l00553"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a88c732d10914f406cc43a2c20cc800c6">  553</a></span>  <span class="keywordtype">size_t</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#a88c732d10914f406cc43a2c20cc800c6">m_dyn_low_lvl_max_packet_size</a>;</div>
<div class="line"><a id="l00554" name="l00554"></a><span class="lineno">  554</span><span class="comment"></span> </div>
<div class="line"><a id="l00555" name="l00555"></a><span class="lineno">  555</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00556" name="l00556"></a><span class="lineno">  556</span><span class="comment">   * This very inside-baseball setting controls the allocation/copy behavior of the UDP receive-deserialize</span></div>
<div class="line"><a id="l00557" name="l00557"></a><span class="lineno">  557</span><span class="comment">   * operation sequence.  When enabled, there is exactly one input buffer large enough to</span></div>
<div class="line"><a id="l00558" name="l00558"></a><span class="lineno">  558</span><span class="comment">   * hold any one serialized incoming packet; any deserialized data (including DATA and ACK payloads) are</span></div>
<div class="line"><a id="l00559" name="l00559"></a><span class="lineno">  559</span><span class="comment">   * stored in separately allocated per-packet buffers; and and the input buffer is repeatedly reused</span></div>
<div class="line"><a id="l00560" name="l00560"></a><span class="lineno">  560</span><span class="comment">   * without reallocation.  When disabled, however, at least some packet types (most notably DATA) will</span></div>
<div class="line"><a id="l00561" name="l00561"></a><span class="lineno">  561</span><span class="comment">   * use the zero-copy principle, having the deserializer take ownership of the input buffer and access pieces</span></div>
<div class="line"><a id="l00562" name="l00562"></a><span class="lineno">  562</span><span class="comment">   * inside it as post-deserialization values (most notably the DATA payload); in this case the input buffer</span></div>
<div class="line"><a id="l00563" name="l00563"></a><span class="lineno">  563</span><span class="comment">   * has to be reallocated between UDP reads.  As of this writing the former behavior seems to be somewhat</span></div>
<div class="line"><a id="l00564" name="l00564"></a><span class="lineno">  564</span><span class="comment">   * faster, especially if low-lvl-max-packet-size is unnecessarily large; but arguably the zero-copy behavior</span></div>
<div class="line"><a id="l00565" name="l00565"></a><span class="lineno">  565</span><span class="comment">   * may become faster if some implementation details related to this change.  So this switch seemed worth</span></div>
<div class="line"><a id="l00566" name="l00566"></a><span class="lineno">  566</span><span class="comment">   * keeping.</span></div>
<div class="line"><a id="l00567" name="l00567"></a><span class="lineno">  567</span><span class="comment">   */</span></div>
<div class="line"><a id="l00568" name="l00568"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#ad041b807fddff912fd6f302abeb88a2f">  568</a></span>  <span class="keywordtype">bool</span> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#ad041b807fddff912fd6f302abeb88a2f">m_dyn_guarantee_one_low_lvl_in_buf_per_socket</a>;</div>
<div class="line"><a id="l00569" name="l00569"></a><span class="lineno">  569</span><span class="comment"></span> </div>
<div class="line"><a id="l00570" name="l00570"></a><span class="lineno">  570</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00571" name="l00571"></a><span class="lineno">  571</span><span class="comment">   * The set of per-Peer_socket options in this per-Node set of options.  This represents the</span></div>
<div class="line"><a id="l00572" name="l00572"></a><span class="lineno">  572</span><span class="comment">   * per-socket options each subsequent socket generated in the corresponding Node will get, unless</span></div>
<div class="line"><a id="l00573" name="l00573"></a><span class="lineno">  573</span><span class="comment">   * user specifies a custom set of such options.</span></div>
<div class="line"><a id="l00574" name="l00574"></a><span class="lineno">  574</span><span class="comment">   *</span></div>
<div class="line"><a id="l00575" name="l00575"></a><span class="lineno">  575</span><span class="comment">   * Note that, in the context of the per-Node options set, this is dynamic; any per-socket option</span></div>
<div class="line"><a id="l00576" name="l00576"></a><span class="lineno">  576</span><span class="comment">   * (even a static one) must be changeable in the global per-Node options set, as otherwise it would just</span></div>
<div class="line"><a id="l00577" name="l00577"></a><span class="lineno">  577</span><span class="comment">   * be a regular per-Node data member in Node_options, as it could never change anyway, so no point in having</span></div>
<div class="line"><a id="l00578" name="l00578"></a><span class="lineno">  578</span><span class="comment">   * it be per-Peer_socket.</span></div>
<div class="line"><a id="l00579" name="l00579"></a><span class="lineno">  579</span><span class="comment">   */</span></div>
<div class="line"><a id="l00580" name="l00580"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a71b56a75a4b6dba57daeef79b0b880f7">  580</a></span>  <a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a> <a class="code hl_variable" href="structflow_1_1net__flow_1_1Node__options.html#a71b56a75a4b6dba57daeef79b0b880f7">m_dyn_sock_opts</a>;</div>
<div class="line"><a id="l00581" name="l00581"></a><span class="lineno">  581</span> </div>
<div class="line"><a id="l00582" name="l00582"></a><span class="lineno">  582</span><span class="keyword">private</span>:</div>
<div class="line"><a id="l00583" name="l00583"></a><span class="lineno">  583</span>  <span class="comment">// Friends.</span></div>
<div class="line"><a id="l00584" name="l00584"></a><span class="lineno">  584</span><span class="comment"></span> </div>
<div class="line"><a id="l00585" name="l00585"></a><span class="lineno">  585</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00586" name="l00586"></a><span class="lineno">  586</span><span class="comment">   * The two `struct`s work together (since Peer_socket_options needs add_config_option()).</span></div>
<div class="line"><a id="l00587" name="l00587"></a><span class="lineno">  587</span><span class="comment">   * @see Peer_socket_options.</span></div>
<div class="line"><a id="l00588" name="l00588"></a><span class="lineno">  588</span><span class="comment">   */</span></div>
<div class="line"><a id="l00589" name="l00589"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#adf3b856cacdfe90cc7b805ea067d3025">  589</a></span>  <span class="keyword">friend</span> <span class="keyword">struct </span><a class="code hl_struct" href="structflow_1_1net__flow_1_1Peer__socket__options.html">Peer_socket_options</a>;<span class="comment"></span></div>
<div class="line"><a id="l00590" name="l00590"></a><span class="lineno">  590</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00591" name="l00591"></a><span class="lineno">  591</span><span class="comment">   * Node needs opt_id_to_str().</span></div>
<div class="line"><a id="l00592" name="l00592"></a><span class="lineno">  592</span><span class="comment">   * @see Node.</span></div>
<div class="line"><a id="l00593" name="l00593"></a><span class="lineno">  593</span><span class="comment">   */</span></div>
<div class="line"><a id="l00594" name="l00594"></a><span class="lineno"><a class="line" href="structflow_1_1net__flow_1_1Node__options.html#a6db9d28bd448a131448276ee03de1e6d">  594</a></span>  <span class="keyword">friend</span> <span class="keyword">class </span><a class="code hl_class" href="classflow_1_1net__flow_1_1Node.html">Node</a>;</div>
<div class="line"><a id="l00595" name="l00595"></a><span class="lineno">  595</span>  <span class="comment">// Friend of Node_options: For access to our internals.</span></div>
<div class="line"><a id="l00596" name="l00596"></a><span class="lineno">  596</span>  <span class="keyword">friend</span> std::ostream&amp; <a class="code hl_friend" href="structflow_1_1net__flow_1_1Node__options.html#a6a3a56f6379c0d5b075bc35f078f9e3d">operator&lt;&lt;</a>(std::ostream&amp; os, <span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1net__flow_1_1Node__options.html">Node_options</a>&amp; opts);</div>
<div class="line"><a id="l00597" name="l00597"></a><span class="lineno">  597</span> </div>
<div class="line"><a id="l00598" name="l00598"></a><span class="lineno">  598</span>  <span class="comment">// Methods.</span></div>
<div class="line"><a id="l00599" name="l00599"></a><span class="lineno">  599</span><span class="comment"></span> </div>
<div class="line"><a id="l00600" name="l00600"></a><span class="lineno">  600</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00601" name="l00601"></a><span class="lineno">  601</span><span class="comment">   * Helper that, for a given option `m_blah`, takes something like `&quot;m_blah_blah&quot;` and returns the</span></div>
<div class="line"><a id="l00602" name="l00602"></a><span class="lineno">  602</span><span class="comment">   * similar more suitable option name the user can use in a config file or command line.  For</span></div>
<div class="line"><a id="l00603" name="l00603"></a><span class="lineno">  603</span><span class="comment">   * example, `&quot;m_st_max_block_size&quot;` yields `&quot;max-block-size&quot;`.</span></div>
<div class="line"><a id="l00604" name="l00604"></a><span class="lineno">  604</span><span class="comment">   *</span></div>
<div class="line"><a id="l00605" name="l00605"></a><span class="lineno">  605</span><span class="comment">   * @param opt_id</span></div>
<div class="line"><a id="l00606" name="l00606"></a><span class="lineno">  606</span><span class="comment">   *        A string whose content equals the name (in C++ code) of a data member of Node_options or</span></div>
<div class="line"><a id="l00607" name="l00607"></a><span class="lineno">  607</span><span class="comment">   *        Peer_socket_options (presumably generated using the macro hash technique).</span></div>
<div class="line"><a id="l00608" name="l00608"></a><span class="lineno">  608</span><span class="comment">   * @return See above.</span></div>
<div class="line"><a id="l00609" name="l00609"></a><span class="lineno">  609</span><span class="comment">   */</span></div>
<div class="line"><a id="l00610" name="l00610"></a><span class="lineno">  610</span>  <span class="keyword">static</span> std::string <a class="code hl_function" href="structflow_1_1net__flow_1_1Node__options.html#aacfe6175ac39447c107413853e578459">opt_id_to_str</a>(<span class="keyword">const</span> std::string&amp; opt_id);</div>
<div class="line"><a id="l00611" name="l00611"></a><span class="lineno">  611</span><span class="comment"></span> </div>
<div class="line"><a id="l00612" name="l00612"></a><span class="lineno">  612</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00613" name="l00613"></a><span class="lineno">  613</span><span class="comment">   * A helper that adds a single option to a given #Options_description, for use either in printing</span></div>
<div class="line"><a id="l00614" name="l00614"></a><span class="lineno">  614</span><span class="comment">   * out the current state of a Node_options or Peer_socket_options; or for parsing of config into such</span></div>
<div class="line"><a id="l00615" name="l00615"></a><span class="lineno">  615</span><span class="comment">   * an object.</span></div>
<div class="line"><a id="l00616" name="l00616"></a><span class="lineno">  616</span><span class="comment">   *</span></div>
<div class="line"><a id="l00617" name="l00617"></a><span class="lineno">  617</span><span class="comment">   * @tparam Opt_type</span></div>
<div class="line"><a id="l00618" name="l00618"></a><span class="lineno">  618</span><span class="comment">   *         The type of a data member of of Node_options or Peer_socket_options.</span></div>
<div class="line"><a id="l00619" name="l00619"></a><span class="lineno">  619</span><span class="comment">   * @param opts_desc</span></div>
<div class="line"><a id="l00620" name="l00620"></a><span class="lineno">  620</span><span class="comment">   *        The #Options_description object into which to load a single `option_description`.</span></div>
<div class="line"><a id="l00621" name="l00621"></a><span class="lineno">  621</span><span class="comment">   * @param opt_id</span></div>
<div class="line"><a id="l00622" name="l00622"></a><span class="lineno">  622</span><span class="comment">   *        A string whose content equals the name (in C++ code) of a data member of Node_options or</span></div>
<div class="line"><a id="l00623" name="l00623"></a><span class="lineno">  623</span><span class="comment">   *        Peer_socket_options (presumably generated using the macro hash technique).</span></div>
<div class="line"><a id="l00624" name="l00624"></a><span class="lineno">  624</span><span class="comment">   * @param target_val</span></div>
<div class="line"><a id="l00625" name="l00625"></a><span class="lineno">  625</span><span class="comment">   *        If `!printout_only`, and the user parses via `*opts_desc`, the parsed option value will be</span></div>
<div class="line"><a id="l00626" name="l00626"></a><span class="lineno">  626</span><span class="comment">   *        loaded into `*target_val`.  Otherwise ignored.</span></div>
<div class="line"><a id="l00627" name="l00627"></a><span class="lineno">  627</span><span class="comment">   * @param default_val</span></div>
<div class="line"><a id="l00628" name="l00628"></a><span class="lineno">  628</span><span class="comment">   *        The default value to this option in `*opts_desc` will be this.</span></div>
<div class="line"><a id="l00629" name="l00629"></a><span class="lineno">  629</span><span class="comment">   * @param description</span></div>
<div class="line"><a id="l00630" name="l00630"></a><span class="lineno">  630</span><span class="comment">   *        If `!printout_only`, the detailed description of the option will be this.  Otherwise ignored.</span></div>
<div class="line"><a id="l00631" name="l00631"></a><span class="lineno">  631</span><span class="comment">   * @param printout_only</span></div>
<div class="line"><a id="l00632" name="l00632"></a><span class="lineno">  632</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00633" name="l00633"></a><span class="lineno">  633</span><span class="comment">   */</span></div>
<div class="line"><a id="l00634" name="l00634"></a><span class="lineno">  634</span>  <span class="keyword">template</span>&lt;<span class="keyword">typename</span> Opt_type&gt;</div>
<div class="line"><a id="l00635" name="l00635"></a><span class="lineno">  635</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Node__options.html#aa27ce9852b67581b0171b716289bea60">add_config_option</a>(<a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">Options_description</a>* opts_desc,</div>
<div class="line"><a id="l00636" name="l00636"></a><span class="lineno">  636</span>                                <span class="keyword">const</span> std::string&amp; opt_id,</div>
<div class="line"><a id="l00637" name="l00637"></a><span class="lineno">  637</span>                                Opt_type* target_val, <span class="keyword">const</span> Opt_type&amp; default_val,</div>
<div class="line"><a id="l00638" name="l00638"></a><span class="lineno">  638</span>                                <span class="keyword">const</span> <span class="keywordtype">char</span>* description, <span class="keywordtype">bool</span> printout_only);</div>
<div class="line"><a id="l00639" name="l00639"></a><span class="lineno">  639</span><span class="comment"></span> </div>
<div class="line"><a id="l00640" name="l00640"></a><span class="lineno">  640</span><span class="comment">  /**</span></div>
<div class="line"><a id="l00641" name="l00641"></a><span class="lineno">  641</span><span class="comment">   * Loads the full set of boost.program_options config options into the given #Options_description,</span></div>
<div class="line"><a id="l00642" name="l00642"></a><span class="lineno">  642</span><span class="comment">   * either for the full help message and parsing config into a Node_options, or for purposes</span></div>
<div class="line"><a id="l00643" name="l00643"></a><span class="lineno">  643</span><span class="comment">   * of printout of the state of an existing Node_options object (e.g., when printing</span></div>
<div class="line"><a id="l00644" name="l00644"></a><span class="lineno">  644</span><span class="comment">   * Node_options to an `ostream`).</span></div>
<div class="line"><a id="l00645" name="l00645"></a><span class="lineno">  645</span><span class="comment">   *</span></div>
<div class="line"><a id="l00646" name="l00646"></a><span class="lineno">  646</span><span class="comment">   * ### `printout_only` case ###</span></div>
<div class="line"><a id="l00647" name="l00647"></a><span class="lineno">  647</span><span class="comment">   * Will generate an #Options_description with &quot;defaults&quot; set to values from a</span></div>
<div class="line"><a id="l00648" name="l00648"></a><span class="lineno">  648</span><span class="comment">   * `defaults_source` object (which should be the object you&#39;re trying to output to a stream), the</span></div>
<div class="line"><a id="l00649" name="l00649"></a><span class="lineno">  649</span><span class="comment">   * names of each option, no detailed option description, and no target for each value should the</span></div>
<div class="line"><a id="l00650" name="l00650"></a><span class="lineno">  650</span><span class="comment">   * caller try to actually parse using `*opts_desc` (which he should not).  This is great when</span></div>
<div class="line"><a id="l00651" name="l00651"></a><span class="lineno">  651</span><span class="comment">   * printing the current contents of a given Node_options (it just reuses the</span></div>
<div class="line"><a id="l00652" name="l00652"></a><span class="lineno">  652</span><span class="comment">   * boost.program_options machinery for this purpose).</span></div>
<div class="line"><a id="l00653" name="l00653"></a><span class="lineno">  653</span><span class="comment">   *</span></div>
<div class="line"><a id="l00654" name="l00654"></a><span class="lineno">  654</span><span class="comment">   * ### `!printout_only` case ###</span></div>
<div class="line"><a id="l00655" name="l00655"></a><span class="lineno">  655</span><span class="comment">   * Will generate an #Options_description with &quot;defaults&quot; set to values from a</span></div>
<div class="line"><a id="l00656" name="l00656"></a><span class="lineno">  656</span><span class="comment">   * `defaults_source` object (which should be a default-constructed Node_options), the</span></div>
<div class="line"><a id="l00657" name="l00657"></a><span class="lineno">  657</span><span class="comment">   * names of each option, detailed option descriptions, and each option&#39;s target inside `*target`,</span></div>
<div class="line"><a id="l00658" name="l00658"></a><span class="lineno">  658</span><span class="comment">   * should the caller actually parse using `*opts_desc`.  This is useful for parsing the options set</span></div>
<div class="line"><a id="l00659" name="l00659"></a><span class="lineno">  659</span><span class="comment">   * from a config file or command line.</span></div>
<div class="line"><a id="l00660" name="l00660"></a><span class="lineno">  660</span><span class="comment">   *</span></div>
<div class="line"><a id="l00661" name="l00661"></a><span class="lineno">  661</span><span class="comment">   * This is the main specification for the different possible options.</span></div>
<div class="line"><a id="l00662" name="l00662"></a><span class="lineno">  662</span><span class="comment">   *</span></div>
<div class="line"><a id="l00663" name="l00663"></a><span class="lineno">  663</span><span class="comment">   * @param opts_desc</span></div>
<div class="line"><a id="l00664" name="l00664"></a><span class="lineno">  664</span><span class="comment">   *        The #Options_description object to load.</span></div>
<div class="line"><a id="l00665" name="l00665"></a><span class="lineno">  665</span><span class="comment">   * @param target</span></div>
<div class="line"><a id="l00666" name="l00666"></a><span class="lineno">  666</span><span class="comment">   *        If `!printout_only`, and the user parses using `*opts_desc`, the parsed values will end up</span></div>
<div class="line"><a id="l00667" name="l00667"></a><span class="lineno">  667</span><span class="comment">   *        in members of `*target`.</span></div>
<div class="line"><a id="l00668" name="l00668"></a><span class="lineno">  668</span><span class="comment">   * @param defaults_source</span></div>
<div class="line"><a id="l00669" name="l00669"></a><span class="lineno">  669</span><span class="comment">   *        The defaults listed (and used, if `!printout_only`, and you choose to parse using</span></div>
<div class="line"><a id="l00670" name="l00670"></a><span class="lineno">  670</span><span class="comment">   *        `*opts_desc`) for each option.</span></div>
<div class="line"><a id="l00671" name="l00671"></a><span class="lineno">  671</span><span class="comment">   * @param printout_only</span></div>
<div class="line"><a id="l00672" name="l00672"></a><span class="lineno">  672</span><span class="comment">   *        See above.</span></div>
<div class="line"><a id="l00673" name="l00673"></a><span class="lineno">  673</span><span class="comment">   */</span></div>
<div class="line"><a id="l00674" name="l00674"></a><span class="lineno">  674</span>  <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code hl_function" href="structflow_1_1net__flow_1_1Node__options.html#a07d18f7e934d079835f5367fbf7d6d1b">setup_config_parsing_helper</a>(<a class="code hl_typedef" href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">Options_description</a>* opts_desc,</div>
<div class="line"><a id="l00675" name="l00675"></a><span class="lineno">  675</span>                                          <a class="code hl_struct" href="structflow_1_1net__flow_1_1Node__options.html">Node_options</a>* target,</div>
<div class="line"><a id="l00676" name="l00676"></a><span class="lineno">  676</span>                                          <span class="keyword">const</span> <a class="code hl_struct" href="structflow_1_1net__flow_1_1Node__options.html">Node_options</a>&amp; defaults_source,</div>
<div class="line"><a id="l00677" name="l00677"></a><span class="lineno">  677</span>                                          <span class="keywordtype">bool</span> printout_only);</div>
<div class="line"><a id="l00678" name="l00678"></a><span class="lineno">  678</span> </div>
<div class="line"><a id="l00679" name="l00679"></a><span class="lineno">  679</span>}; <span class="comment">// struct Node_options</span></div>
<div class="line"><a id="l00680" name="l00680"></a><span class="lineno">  680</span> </div>
<div class="line"><a id="l00681" name="l00681"></a><span class="lineno">  681</span><span class="comment">// Free functions: in *_fwd.hpp.</span></div>
<div class="line"><a id="l00682" name="l00682"></a><span class="lineno">  682</span> </div>
<div class="line"><a id="l00683" name="l00683"></a><span class="lineno">  683</span><span class="comment">// However the following refer to inner type(s) and hence must be declared here and not _fwd.hpp.</span></div>
<div class="line"><a id="l00684" name="l00684"></a><span class="lineno">  684</span><span class="comment"></span> </div>
<div class="line"><a id="l00685" name="l00685"></a><span class="lineno">  685</span><span class="comment">/**</span></div>
<div class="line"><a id="l00686" name="l00686"></a><span class="lineno">  686</span><span class="comment"> * Deserializes a Peer_socket_options::Congestion_control_strategy_choice `enum` from</span></div>
<div class="line"><a id="l00687" name="l00687"></a><span class="lineno">  687</span><span class="comment"> * a standard input stream.  Reads a single space-delimited token</span></div>
<div class="line"><a id="l00688" name="l00688"></a><span class="lineno">  688</span><span class="comment"> * from the given stream.  Maps that token to an aforementioned enumeration value.</span></div>
<div class="line"><a id="l00689" name="l00689"></a><span class="lineno">  689</span><span class="comment"> * If the token is not recognized or cannot be read, some reasonable</span></div>
<div class="line"><a id="l00690" name="l00690"></a><span class="lineno">  690</span><span class="comment"> * default strategy is chosen.  This enables a few key things to</span></div>
<div class="line"><a id="l00691" name="l00691"></a><span class="lineno">  691</span><span class="comment"> * work, including parsing from config file/command line via and conversion from `string` via `boost::lexical_cast`.</span></div>
<div class="line"><a id="l00692" name="l00692"></a><span class="lineno">  692</span><span class="comment"> *</span></div>
<div class="line"><a id="l00693" name="l00693"></a><span class="lineno">  693</span><span class="comment"> * @relatesalso Peer_socket_options</span></div>
<div class="line"><a id="l00694" name="l00694"></a><span class="lineno">  694</span><span class="comment"> *</span></div>
<div class="line"><a id="l00695" name="l00695"></a><span class="lineno">  695</span><span class="comment"> * @param is</span></div>
<div class="line"><a id="l00696" name="l00696"></a><span class="lineno">  696</span><span class="comment"> *        Stream from which to deserialize.</span></div>
<div class="line"><a id="l00697" name="l00697"></a><span class="lineno">  697</span><span class="comment"> * @param strategy_choice</span></div>
<div class="line"><a id="l00698" name="l00698"></a><span class="lineno">  698</span><span class="comment"> *        Reference to `enum` value which to set to the mapped strategy.</span></div>
<div class="line"><a id="l00699" name="l00699"></a><span class="lineno">  699</span><span class="comment"> * @return `is`.</span></div>
<div class="line"><a id="l00700" name="l00700"></a><span class="lineno">  700</span><span class="comment"> *</span></div>
<div class="line"><a id="l00701" name="l00701"></a><span class="lineno">  701</span><span class="comment"> * @internal</span></div>
<div class="line"><a id="l00702" name="l00702"></a><span class="lineno">  702</span><span class="comment"> * @todo Peer_socket_options::Congestion_control_strategy_choice stream inserter `&lt;&lt;` and `&gt;&gt;` operators should use</span></div>
<div class="line"><a id="l00703" name="l00703"></a><span class="lineno">  703</span><span class="comment"> * the flow::util::istream_to_enum() pattern which is much easier than the overwrought old thing in there now involving</span></div>
<div class="line"><a id="l00704" name="l00704"></a><span class="lineno">  704</span><span class="comment"> * two `map`s.  Perhaps add a generic `enum_to_strings()` to provide the body for</span></div>
<div class="line"><a id="l00705" name="l00705"></a><span class="lineno">  705</span><span class="comment"> * net_flow::Congestion_control_selector::get_ids().</span></div>
<div class="line"><a id="l00706" name="l00706"></a><span class="lineno">  706</span><span class="comment"> */</span></div>
<div class="line"><a id="l00707" name="l00707"></a><span class="lineno">  707</span>std::istream&amp; <a class="code hl_function" href="namespaceflow_1_1net__flow.html#aad968d3e7e9c3f284bea03e799d5fbc0">operator&gt;&gt;</a>(std::istream&amp; is,</div>
<div class="line"><a id="l00708" name="l00708"></a><span class="lineno">  708</span>                         <a class="code hl_enumeration" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">Peer_socket_options::Congestion_control_strategy_choice</a>&amp; strategy_choice);</div>
<div class="line"><a id="l00709" name="l00709"></a><span class="lineno">  709</span><span class="comment"></span> </div>
<div class="line"><a id="l00710" name="l00710"></a><span class="lineno">  710</span><span class="comment">/**</span></div>
<div class="line"><a id="l00711" name="l00711"></a><span class="lineno">  711</span><span class="comment"> * Serializes a Peer_socket_options::Congestion_control_strategy_choice `enum` to a standard `ostream` -- the reverse of</span></div>
<div class="line"><a id="l00712" name="l00712"></a><span class="lineno">  712</span><span class="comment"> * operator&gt;&gt;(). Writes a space-less token to the given stream based on the given strategy `enum` value.  This</span></div>
<div class="line"><a id="l00713" name="l00713"></a><span class="lineno">  713</span><span class="comment"> * enables a few key things to work, including output of defaults and values in the help via</span></div>
<div class="line"><a id="l00714" name="l00714"></a><span class="lineno">  714</span><span class="comment"> * Peer_socket_options, and conversion to `string` via `boost::lexical_cast`.</span></div>
<div class="line"><a id="l00715" name="l00715"></a><span class="lineno">  715</span><span class="comment"> *</span></div>
<div class="line"><a id="l00716" name="l00716"></a><span class="lineno">  716</span><span class="comment"> * @relatesalso Peer_socket_options</span></div>
<div class="line"><a id="l00717" name="l00717"></a><span class="lineno">  717</span><span class="comment"> *</span></div>
<div class="line"><a id="l00718" name="l00718"></a><span class="lineno">  718</span><span class="comment"> * @param os</span></div>
<div class="line"><a id="l00719" name="l00719"></a><span class="lineno">  719</span><span class="comment"> *        Stream to which to serialize.</span></div>
<div class="line"><a id="l00720" name="l00720"></a><span class="lineno">  720</span><span class="comment"> * @param strategy_choice</span></div>
<div class="line"><a id="l00721" name="l00721"></a><span class="lineno">  721</span><span class="comment"> *        Value to serialize.</span></div>
<div class="line"><a id="l00722" name="l00722"></a><span class="lineno">  722</span><span class="comment"> * @return `os`.</span></div>
<div class="line"><a id="l00723" name="l00723"></a><span class="lineno">  723</span><span class="comment"> */</span></div>
<div class="line"><a id="l00724" name="l00724"></a><span class="lineno">  724</span>std::ostream&amp; <a class="code hl_function" href="namespaceflow_1_1net__flow.html#ab9f537c84f77e9b8fa742fc5dc6d5693">operator&lt;&lt;</a>(std::ostream&amp; os,</div>
<div class="line"><a id="l00725" name="l00725"></a><span class="lineno">  725</span>                         <span class="keyword">const</span> <a class="code hl_enumeration" href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">Peer_socket_options::Congestion_control_strategy_choice</a>&amp; strategy_choice);</div>
<div class="line"><a id="l00726" name="l00726"></a><span class="lineno">  726</span> </div>
<div class="line"><a id="l00727" name="l00727"></a><span class="lineno">  727</span> </div>
<div class="line"><a id="l00728" name="l00728"></a><span class="lineno">  728</span>} <span class="comment">// namespace flow::net_flow</span></div>
<div class="ttc" id="aclassflow_1_1net__flow_1_1Node_html"><div class="ttname"><a href="classflow_1_1net__flow_1_1Node.html">flow::net_flow::Node</a></div><div class="ttdoc">An object of this class is a single Flow-protocol networking node, in the sense that: (1) it has a di...</div><div class="ttdef"><b>Definition:</b> <a href="node_8hpp_source.html#l00930">node.hpp:934</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html"><div class="ttname"><a href="namespaceflow_1_1net__flow.html">flow::net_flow</a></div><div class="ttdoc">Flow module containing the API and implementation of the Flow network protocol, a TCP-inspired stream...</div><div class="ttdef"><b>Definition:</b> <a href="asio_2node_8cpp_source.html#l00024">node.cpp:25</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html_aad968d3e7e9c3f284bea03e799d5fbc0"><div class="ttname"><a href="namespaceflow_1_1net__flow.html#aad968d3e7e9c3f284bea03e799d5fbc0">flow::net_flow::operator&gt;&gt;</a></div><div class="ttdeci">std::istream &amp; operator&gt;&gt;(std::istream &amp;is, Congestion_control_selector::Strategy_choice &amp;strategy_choice)</div><div class="ttdoc">Deserializes a Peer_socket_options::Congestion_control_strategy_choice enum from a standard input str...</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl_8cpp_source.html#l00124">cong_ctl.cpp:124</a></div></div>
<div class="ttc" id="anamespaceflow_1_1net__flow_html_ab9f537c84f77e9b8fa742fc5dc6d5693"><div class="ttname"><a href="namespaceflow_1_1net__flow.html#ab9f537c84f77e9b8fa742fc5dc6d5693">flow::net_flow::operator&lt;&lt;</a></div><div class="ttdeci">std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Congestion_control_selector::Strategy_choice &amp;strategy_choice)</div><div class="ttdoc">Serializes a Peer_socket_options::Congestion_control_strategy_choice enum to a standard ostream – the...</div><div class="ttdef"><b>Definition:</b> <a href="cong__ctl_8cpp_source.html#l00146">cong_ctl.cpp:146</a></div></div>
<div class="ttc" id="anamespaceflow_html_a48799f1263cdeedec125be51a3db2b79"><div class="ttname"><a href="namespaceflow.html#a48799f1263cdeedec125be51a3db2b79">flow::Fine_duration</a></div><div class="ttdeci">Fine_clock::duration Fine_duration</div><div class="ttdoc">A high-res time duration as computed from two Fine_time_pts.</div><div class="ttdef"><b>Definition:</b> <a href="common_8hpp_source.html#l00416">common.hpp:416</a></div></div>
<div class="ttc" id="anet__flow__fwd_8hpp_html"><div class="ttname"><a href="net__flow__fwd_8hpp.html">net_flow_fwd.hpp</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html">flow::net_flow::Node_options</a></div><div class="ttdoc">A set of low-level options affecting a single Flow Node, including Peer_socket objects and other obje...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00448">options.hpp:449</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a07d18f7e934d079835f5367fbf7d6d1b"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a07d18f7e934d079835f5367fbf7d6d1b">flow::net_flow::Node_options::setup_config_parsing_helper</a></div><div class="ttdeci">static void setup_config_parsing_helper(Options_description *opts_desc, Node_options *target, const Node_options &amp;defaults_source, bool printout_only)</div><div class="ttdoc">Loads the full set of boost.program_options config options into the given Options_description,...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00080">options.cpp:80</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a5819e60ed58aafb496e39962c89215f1"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a5819e60ed58aafb496e39962c89215f1">flow::net_flow::Node_options::setup_config_parsing</a></div><div class="ttdeci">void setup_config_parsing(Options_description *opts_desc)</div><div class="ttdoc">Modifies a boost.program_options options description object to enable subsequent parsing of a command...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00146">options.cpp:146</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a5e19fc9671473ace300d457f7334dc31"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a5e19fc9671473ace300d457f7334dc31">flow::net_flow::Node_options::Node_options</a></div><div class="ttdeci">Node_options()</div><div class="ttdoc">Constructs a Node_options with values equal to those used by Node when the Node creator chooses not t...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00041">options.cpp:41</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a6733e4efbec3ed97b2460bf50d7cc67c"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a6733e4efbec3ed97b2460bf50d7cc67c">flow::net_flow::Node_options::Fine_duration</a></div><div class="ttdeci">Peer_socket_options::Fine_duration Fine_duration</div><div class="ttdoc">A time duration, with fine precision.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00456">options.hpp:456</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a6a3a56f6379c0d5b075bc35f078f9e3d"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a6a3a56f6379c0d5b075bc35f078f9e3d">flow::net_flow::Node_options::operator&lt;&lt;</a></div><div class="ttdeci">friend std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Node_options &amp;opts)</div><div class="ttdoc">Prints the name of each option in the given Node_options, along with its current value,...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00152">options.cpp:152</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a71b56a75a4b6dba57daeef79b0b880f7"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a71b56a75a4b6dba57daeef79b0b880f7">flow::net_flow::Node_options::m_dyn_sock_opts</a></div><div class="ttdeci">Peer_socket_options m_dyn_sock_opts</div><div class="ttdoc">The set of per-Peer_socket options in this per-Node set of options.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00580">options.hpp:580</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a78baaf1a911c8d490a13278422307e8a"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a78baaf1a911c8d490a13278422307e8a">flow::net_flow::Node_options::m_st_low_lvl_max_buf_size</a></div><div class="ttdeci">size_t m_st_low_lvl_max_buf_size</div><div class="ttdoc">The max size to ask the OS to set our UDP socket's receive buffer to in order to minimize loss if we ...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00525">options.hpp:525</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a88c732d10914f406cc43a2c20cc800c6"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a88c732d10914f406cc43a2c20cc800c6">flow::net_flow::Node_options::m_dyn_low_lvl_max_packet_size</a></div><div class="ttdeci">size_t m_dyn_low_lvl_max_packet_size</div><div class="ttdoc">Any incoming low-level (UDP) packet will be truncated to this size.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00553">options.hpp:553</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_a99cb19cf77ac787103ac616f4415eaf9"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#a99cb19cf77ac787103ac616f4415eaf9">flow::net_flow::Node_options::m_dyn_max_packets_per_main_loop_iteration</a></div><div class="ttdeci">unsigned int m_dyn_max_packets_per_main_loop_iteration</div><div class="ttdoc">The UDP net-stack may deliver 2 or more datagrams to the Flow Node at the same time.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00545">options.hpp:545</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_aa27ce9852b67581b0171b716289bea60"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#aa27ce9852b67581b0171b716289bea60">flow::net_flow::Node_options::add_config_option</a></div><div class="ttdeci">static void add_config_option(Options_description *opts_desc, const std::string &amp;opt_id, Opt_type *target_val, const Opt_type &amp;default_val, const char *description, bool printout_only)</div><div class="ttdoc">A helper that adds a single option to a given Options_description, for use either in printing out the...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00061">options.cpp:61</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_aacfe6175ac39447c107413853e578459"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#aacfe6175ac39447c107413853e578459">flow::net_flow::Node_options::opt_id_to_str</a></div><div class="ttdeci">static std::string opt_id_to_str(const std::string &amp;opt_id)</div><div class="ttdoc">Helper that, for a given option m_blah, takes something like &quot;m_blah_blah&quot; and returns the similar mo...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00160">options.cpp:160</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_abef8889be34024b07eff3211a3213d5f"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#abef8889be34024b07eff3211a3213d5f">flow::net_flow::Node_options::m_st_timer_min_period</a></div><div class="ttdeci">Fine_duration m_st_timer_min_period</div><div class="ttdoc">A time period such that the boost.asio timer implementation for this platform is able to accurately a...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00534">options.hpp:534</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_ad041b807fddff912fd6f302abeb88a2f"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#ad041b807fddff912fd6f302abeb88a2f">flow::net_flow::Node_options::m_dyn_guarantee_one_low_lvl_in_buf_per_socket</a></div><div class="ttdeci">bool m_dyn_guarantee_one_low_lvl_in_buf_per_socket</div><div class="ttdoc">This very inside-baseball setting controls the allocation/copy behavior of the UDP receive-deserializ...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00568">options.hpp:568</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_aea7861f3c7739f8e588293d16a2de447"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#aea7861f3c7739f8e588293d16a2de447">flow::net_flow::Node_options::m_st_capture_interrupt_signals_internally</a></div><div class="ttdeci">bool m_st_capture_interrupt_signals_internally</div><div class="ttdoc">If and only if this is true, the Node will detect SIGINT and SIGTERM (or your OS's version thereof); ...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00517">options.hpp:517</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Node__options_html_af93781c0e8136a82e41080701719d996"><div class="ttname"><a href="structflow_1_1net__flow_1_1Node__options.html#af93781c0e8136a82e41080701719d996">flow::net_flow::Node_options::Options_description</a></div><div class="ttdeci">Peer_socket_options::Options_description Options_description</div><div class="ttdoc">Short-hand for boost.program_options config options description. See setup_config_parsing().</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00453">options.hpp:453</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html">flow::net_flow::Peer_socket_options</a></div><div class="ttdoc">A set of low-level options affecting a single Peer_socket.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00035">options.hpp:36</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a02afb5ed4201d83c87a3a30fcbdda489"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a02afb5ed4201d83c87a3a30fcbdda489">flow::net_flow::Peer_socket_options::m_st_init_drop_timeout</a></div><div class="ttdeci">Fine_duration m_st_init_drop_timeout</div><div class="ttdoc">Once socket enters ESTABLISHED state, this is the value for Peer_socket::m_snd_drop_timeout until the...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00226">options.hpp:226</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a0b37da87848d01220c7e58f90e6764ba"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a0b37da87848d01220c7e58f90e6764ba">flow::net_flow::Peer_socket_options::m_st_max_rexmissions_per_packet</a></div><div class="ttdeci">unsigned int m_st_max_rexmissions_per_packet</div><div class="ttdoc">If retransmission is enabled and a given packet is retransmitted this many times and has to be retran...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00220">options.hpp:220</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a171480324f26432928738532cb3c8556"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a171480324f26432928738532cb3c8556">flow::net_flow::Peer_socket_options::m_st_rcv_buf_max_size</a></div><div class="ttdeci">size_t m_st_rcv_buf_max_size</div><div class="ttdoc">Maximum number of bytes that the Receive buffer can hold.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00141">options.hpp:141</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a1bdc21e84373dd96494a76f11603335e"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a1bdc21e84373dd96494a76f11603335e">flow::net_flow::Peer_socket_options::m_st_cong_ctl_max_cong_wnd_blocks</a></div><div class="ttdeci">size_t m_st_cong_ctl_max_cong_wnd_blocks</div><div class="ttdoc">The constant that determines the CWND limit in Congestion_control_classic_data::congestion_window_at_...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00296">options.hpp:296</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a2a3d420992e19e5addb7193d607e82e4"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a3d420992e19e5addb7193d607e82e4">flow::net_flow::Peer_socket_options::m_st_snd_bandwidth_est_sample_period_floor</a></div><div class="ttdeci">Fine_duration m_st_snd_bandwidth_est_sample_period_floor</div><div class="ttdoc">When estimating the available send bandwidth, each sample must be compiled over at least this long of...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00267">options.hpp:267</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a2a7ab1e27acd52d8fa3aadc9eb13d116"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2a7ab1e27acd52d8fa3aadc9eb13d116">flow::net_flow::Peer_socket_options::m_st_cong_ctl_cong_avoidance_increment_blocks</a></div><div class="ttdeci">unsigned int m_st_cong_ctl_cong_avoidance_increment_blocks</div><div class="ttdoc">The multiple of max-block-size by which to increment CWND in congestion avoidance mode after receivin...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00306">options.hpp:306</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a2c8fcb08dfb0d1ebcc21e02940c149e8"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a2c8fcb08dfb0d1ebcc21e02940c149e8">flow::net_flow::Peer_socket_options::m_st_cong_ctl_cong_wnd_on_drop_timeout_blocks</a></div><div class="ttdeci">size_t m_st_cong_ctl_cong_wnd_on_drop_timeout_blocks</div><div class="ttdoc">On Drop Timeout, set congestion window to this value times max-block-size.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00299">options.hpp:299</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a371e3340cecf792f0fd815b55dd25f60"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a371e3340cecf792f0fd815b55dd25f60">flow::net_flow::Peer_socket_options::m_dyn_rcv_wnd_recovery_max_period</a></div><div class="ttdeci">Fine_duration m_dyn_rcv_wnd_recovery_max_period</div><div class="ttdoc">Approximate amount of time since the beginning of rcv_wnd recovery due to rcv-buf-max-size-to-adverti...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00339">options.hpp:339</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a3954beff8f73e2d6f566f4e15c30219c"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a3954beff8f73e2d6f566f4e15c30219c">flow::net_flow::Peer_socket_options::operator&lt;&lt;</a></div><div class="ttdeci">friend std::ostream &amp; operator&lt;&lt;(std::ostream &amp;os, const Peer_socket_options &amp;opts)</div><div class="ttdoc">Prints the name of each option in the given Peer_socket_options, along with its current value,...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00484">options.cpp:484</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a42ce94dbc5d8be28134261c2eb18b245"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a42ce94dbc5d8be28134261c2eb18b245">flow::net_flow::Peer_socket_options::Congestion_control_strategy_choice</a></div><div class="ttdeci">Congestion_control_strategy_choice</div><div class="ttdoc">The possible choices for congestion control strategy for the socket.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00062">options.hpp:63</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a637811d19d4a2b4d9b3ab79742aadff8"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a637811d19d4a2b4d9b3ab79742aadff8">flow::net_flow::Peer_socket_options::m_st_cong_ctl_init_cong_wnd_blocks</a></div><div class="ttdeci">size_t m_st_cong_ctl_init_cong_wnd_blocks</div><div class="ttdoc">The initial size of the congestion window, given in units of max-block-size-sized blocks.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00277">options.hpp:277</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a638ca4ecd9d8bfc8710bda71687c4ea3"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a638ca4ecd9d8bfc8710bda71687c4ea3">flow::net_flow::Peer_socket_options::m_st_drop_packet_exactly_after_drop_timeout</a></div><div class="ttdeci">bool m_st_drop_packet_exactly_after_drop_timeout</div><div class="ttdoc">If true, when scheduling Drop Timer, schedule it for Drop Timeout relative to the send time of the ea...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00233">options.hpp:233</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a6c35e6014182ccfcbee6bed4571a8360"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a6c35e6014182ccfcbee6bed4571a8360">flow::net_flow::Peer_socket_options::m_st_rexmit_on</a></div><div class="ttdeci">bool m_st_rexmit_on</div><div class="ttdoc">Whether to enable reliability via retransmission.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00214">options.hpp:214</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a78cbfb464f3251f63a06c753c986d277"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a78cbfb464f3251f63a06c753c986d277">flow::net_flow::Peer_socket_options::Fine_duration</a></div><div class="ttdeci">flow::Fine_duration Fine_duration</div><div class="ttdoc">A time duration, with fine precision, that can be positive, zero, or negative (unless a specific opti...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00059">options.hpp:59</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a8ca6086022691700f5e5d2dc87ca92fd"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8ca6086022691700f5e5d2dc87ca92fd">flow::net_flow::Peer_socket_options::m_st_snd_buf_max_size</a></div><div class="ttdeci">size_t m_st_snd_buf_max_size</div><div class="ttdoc">Maximum number of bytes that the Send buffer can hold.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00134">options.hpp:134</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_a8f18c8222ade5f99b83a85e0203ff130"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#a8f18c8222ade5f99b83a85e0203ff130">flow::net_flow::Peer_socket_options::m_st_connect_retransmit_period</a></div><div class="ttdeci">Fine_duration m_st_connect_retransmit_period</div><div class="ttdoc">How often to resend SYN or SYN_ACK while SYN_ACK or SYN_ACK_ACK, respectively, has not been received.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00121">options.hpp:121</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_aa6d16c98186187fdffadcfb853d58410"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#aa6d16c98186187fdffadcfb853d58410">flow::net_flow::Peer_socket_options::m_st_rcv_buf_max_size_slack_percent</a></div><div class="ttdeci">unsigned int m_st_rcv_buf_max_size_slack_percent</div><div class="ttdoc">% of rcv-buf-max-size such that if Receive buffer stores up to (100 + this many) % of rcv-buf-max-siz...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00160">options.hpp:160</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_aa6d94acf3c746c8f59c91ffa824ef8bd"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#aa6d94acf3c746c8f59c91ffa824ef8bd">flow::net_flow::Peer_socket_options::setup_config_parsing</a></div><div class="ttdeci">void setup_config_parsing(Options_description *opts_desc)</div><div class="ttdoc">Analogous to Node_options::setup_config_parsing().</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00478">options.cpp:478</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ac31b91c6f8c7b0d7a4e29fd218e5f9dc"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac31b91c6f8c7b0d7a4e29fd218e5f9dc">flow::net_flow::Peer_socket_options::Peer_socket_options</a></div><div class="ttdeci">Peer_socket_options()</div><div class="ttdoc">Constructs a Peer_socket_options with values equal to those used by Node when the Node creator choose...</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00184">options.cpp:184</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ac38c0bbba5edbb4964a3914ccf56018f"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac38c0bbba5edbb4964a3914ccf56018f">flow::net_flow::Peer_socket_options::m_dyn_rcv_wnd_recovery_timer_period</a></div><div class="ttdeci">Fine_duration m_dyn_rcv_wnd_recovery_timer_period</div><div class="ttdoc">When the mode triggered by rcv-buf-max-size-to-advertise-percent being exceeded is in effect,...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00333">options.hpp:333</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ac6f4da1892e2157e60772ed74298b2b2"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac6f4da1892e2157e60772ed74298b2b2">flow::net_flow::Peer_socket_options::m_st_drop_all_on_drop_timeout</a></div><div class="ttdeci">bool m_st_drop_all_on_drop_timeout</div><div class="ttdoc">If true, when the Drop Timer fires, all In-flight packets are to be considered Dropped (and thus the ...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00240">options.hpp:240</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ac75171c4f1086d0aa38248ae5ffba884"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ac75171c4f1086d0aa38248ae5ffba884">flow::net_flow::Peer_socket_options::m_st_connect_retransmit_timeout</a></div><div class="ttdeci">Fine_duration m_st_connect_retransmit_timeout</div><div class="ttdoc">How long from the first SYN or SYN_ACK to allow for connection handshake before aborting connection.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00124">options.hpp:124</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_aca69056d3029193823f0c0ae630f5759"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#aca69056d3029193823f0c0ae630f5759">flow::net_flow::Peer_socket_options::m_st_cong_ctl_strategy</a></div><div class="ttdeci">Congestion_control_strategy_choice m_st_cong_ctl_strategy</div><div class="ttdoc">The congestion control algorithm to use for the connection or connections.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00270">options.hpp:270</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ad0015d953f3079a326ba6dce5d0bff89"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad0015d953f3079a326ba6dce5d0bff89">flow::net_flow::Peer_socket_options::setup_config_parsing_helper</a></div><div class="ttdeci">static void setup_config_parsing_helper(Options_description *opts_desc, Peer_socket_options *target, const Peer_socket_options &amp;defaults_source, bool printout_only)</div><div class="ttdoc">Analogous to Node_options::setup_config_parsing_helper().</div><div class="ttdef"><b>Definition:</b> <a href="options_8cpp_source.html#l00271">options.cpp:271</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ad65db0c4fdf22bf5723dc3018174b4aa"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad65db0c4fdf22bf5723dc3018174b4aa">flow::net_flow::Peer_socket_options::Options_description</a></div><div class="ttdeci">boost::program_options::options_description Options_description</div><div class="ttdoc">Short-hand for boost.program_options config options description. See setup_config_parsing().</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00040">options.hpp:40</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ad7a76f7ae03e258b30b04c7350481de6"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7a76f7ae03e258b30b04c7350481de6">flow::net_flow::Peer_socket_options::m_st_max_full_blocks_before_ack_send</a></div><div class="ttdeci">size_t m_st_max_full_blocks_before_ack_send</div><div class="ttdoc">If there are at least this many TIMES max-block-size bytes' worth of individual acknowledgments to be...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00198">options.hpp:198</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ad7cbcdd64a4366740ff9e55b39c977ba"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad7cbcdd64a4366740ff9e55b39c977ba">flow::net_flow::Peer_socket_options::m_st_snd_pacing_enabled</a></div><div class="ttdeci">bool m_st_snd_pacing_enabled</div><div class="ttdoc">Enables or disables packet pacing, which attempts to spread out, without sacrificing overall send thr...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00258">options.hpp:258</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ad9a31f63eea6f89952a89ea0385d9a2e"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ad9a31f63eea6f89952a89ea0385d9a2e">flow::net_flow::Peer_socket_options::m_st_rcv_flow_control_on</a></div><div class="ttdeci">bool m_st_rcv_flow_control_on</div><div class="ttdoc">Whether flow control (a/k/a receive window a/k/a rcv_wnd management) is enabled.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00150">options.hpp:150</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_add7ccb9e8cd0715ca78e0710d2a6db06"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#add7ccb9e8cd0715ca78e0710d2a6db06">flow::net_flow::Peer_socket_options::m_st_delayed_ack_timer_period</a></div><div class="ttdeci">Fine_duration m_st_delayed_ack_timer_period</div><div class="ttdoc">The maximum amount of time to delay sending ACK with individual packet's acknowledgment since receivi...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00191">options.hpp:191</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ae2551f2995f5830e0461bec6fdd9035e"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae2551f2995f5830e0461bec6fdd9035e">flow::net_flow::Peer_socket_options::m_dyn_drop_timeout_backoff_factor</a></div><div class="ttdeci">unsigned int m_dyn_drop_timeout_backoff_factor</div><div class="ttdoc">Whenever the Drop Timer fires, upon the requisite Dropping of packet(s), the DTO (Drop Timeout) is se...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00325">options.hpp:325</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_ae7d5eb1b4e37317478c3b25bc3c8c245"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#ae7d5eb1b4e37317478c3b25bc3c8c245">flow::net_flow::Peer_socket_options::m_st_out_of_order_ack_restarts_drop_timer</a></div><div class="ttdeci">bool m_st_out_of_order_ack_restarts_drop_timer</div><div class="ttdoc">If an In-flight packet is acknowledged, but it is not the earliest In-flight packet (i....</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00248">options.hpp:248</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_aeaaf832a38a5e334789e81e214686ea7"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeaaf832a38a5e334789e81e214686ea7">flow::net_flow::Peer_socket_options::m_st_max_block_size</a></div><div class="ttdeci">size_t m_st_max_block_size</div><div class="ttdoc">The size of block that we will strive to (and will, assuming at least that many bytes are available i...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00114">options.hpp:114</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_aeccfe97128c9f5f62ff26d73047dec2e"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#aeccfe97128c9f5f62ff26d73047dec2e">flow::net_flow::Peer_socket_options::m_st_cong_ctl_classic_wnd_decay_percent</a></div><div class="ttdeci">unsigned int m_st_cong_ctl_classic_wnd_decay_percent</div><div class="ttdoc">In classic congestion control, RFC 5681 specifies the window should be halved on loss; this option al...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00314">options.hpp:314</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_af483d0292f363e7dbf14dc7a2dd49f3f"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#af483d0292f363e7dbf14dc7a2dd49f3f">flow::net_flow::Peer_socket_options::m_st_rcv_buf_max_size_to_advertise_percent</a></div><div class="ttdeci">unsigned int m_st_rcv_buf_max_size_to_advertise_percent</div><div class="ttdoc">% of rcv-buf-max-size that has to be freed, since the last receive window advertisement,...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00171">options.hpp:171</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_af78ca6cf3c6da3bc24cea40d522f0bdb"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#af78ca6cf3c6da3bc24cea40d522f0bdb">flow::net_flow::Peer_socket_options::m_st_rcv_max_packets_after_unrecvd_packet_ratio_percent</a></div><div class="ttdeci">unsigned int m_st_rcv_max_packets_after_unrecvd_packet_ratio_percent</div><div class="ttdoc">The limit on the size of Peer_socket::m_rcv_packets_with_gaps, expressed as what percentage the maxim...</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00183">options.hpp:183</a></div></div>
<div class="ttc" id="astructflow_1_1net__flow_1_1Peer__socket__options_html_afd02a9d91ef5e5c13ea95ea35624da1a"><div class="ttname"><a href="structflow_1_1net__flow_1_1Peer__socket__options.html#afd02a9d91ef5e5c13ea95ea35624da1a">flow::net_flow::Peer_socket_options::m_dyn_drop_timeout_ceiling</a></div><div class="ttdeci">Fine_duration m_dyn_drop_timeout_ceiling</div><div class="ttdoc">Ceiling to impose on the Drop Timeout.</div><div class="ttdef"><b>Definition:</b> <a href="options_8hpp_source.html#l00317">options.hpp:317</a></div></div>
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